Training Grounds — ruling 1

Training Grounds affects only creatures you control on the battlefield. The costs of activated abilities that work in other zones (such as cycling or unearth) won't be reduced.

Training Grounds — ruling 2

Training Grounds can reduce the amount you pay for a creature's activated ability cost that includes {X}. For example, Drana, Kalastria Bloodchief has an activated ability that costs {X}{B}{B}. If you control Training Grounds and you activate the ability with X equal to 5, you'll have to pay only {3}{B}{B}. This is true even if the ability states that {X} must be paid with a certain color of mana, as Crimson Hellkite's ability does.

Training Grounds — ruling 3

Training Grounds takes the total cost to activate a creature's activated ability into account, not just the cost printed on it. For example, Urabrask has an activated ability that costs {R}, and Suppression Field says "Activated abilities cost {2} more to activate unless they're mana abilities." Since activating Urabrask's activated ability would now cost {2}{R}, Training Grounds reduces that cost back to {R}.

Training Grounds — ruling 4

If an activated ability of a creature you control costs no generic mana to activate (for example, if it costs {R}{R}, it costs {0}, or it costs only nonmana actions such as {T} or "Sacrifice a creature"), Training Grounds simply won't affect it. In particular, it won't increase the cost to include a mana payment of {1}.

Training Grounds — ruling 5

Training Grounds reduces the generic mana in waterbend costs for activated abilities. It will not reduce waterbend costs that are additional costs for casting spells.

Training Grounds — ruling 6

Training Grounds won't affect the part of an activation cost represented by colored mana symbols or snow mana symbols. It also won't affect nonmana parts of an activation cost, if there are any.

Training Grounds — ruling 7

Training Grounds can reduce the part of an activation cost represented by generic mana symbols down to nothing, as long as it still costs at least one mana. For example, if an activation cost is {2}{G}, you'd have to pay only {G}. If an activation cost is {2}, though, you'd still have to pay {1}.

Training Grounds — ruling 8

Training Grounds won't affect a cost that isn't the cost to activate a creature's activated ability. For example, it won't affect Flameblast Dragon's {X}{R} cost, since that's a cost paid when a triggered ability resolves, and it won't affect a kicker cost, since that's an additional cost to cast a spell. Activated ability costs appear before a colon (:) in a card's rules text, or, in the case of some keywords, before a colon in reminder text.

Training Grounds : règles, fonctionnement et interactions (MTG)

Training Grounds is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

Complete guide

Training Grounds is a powerful blue enchantment that serves as a cornerstone for combo decks and value engines alike. By drastically reducing the cost of your creatures' activated abilities, it transforms expensive effects into efficient tools for victory. Understanding the limitations of this reduction is key to maximizing its potential on the battlefield.

What It Does

Training Grounds provides a passive reduction of up to {2} to the activated abilities of creatures you control. An activated ability is always formatted as 'Cost: Effect.' This reduction only applies to generic mana in the cost and only to creatures currently on the battlefield. It does not affect triggered abilities (which start with 'When,' 'Whenever,' or 'At') or spells you are casting from your hand.

How It Resolves Step by Step

When you choose to activate a creature's ability, you first determine the total cost. Start with the printed cost or any alternative costs, then add any cost increases (like Suppression Field). After these are totaled, apply the reduction from Training Grounds. Finally, check the 'one mana' rule: if the resulting cost would be zero mana, it is rounded back up to {1}. If the cost already includes colored mana (like {U}), Training Grounds can reduce the generic portion to zero, as the {U} satisfies the 'at least one mana' requirement.

Common Mistakes

A frequent error is trying to use Training Grounds to reduce costs of cards not on the battlefield, such as Cycling or Unearth; these do not count as 'creatures you control' until they are permanents. Additionally, it cannot reduce colored mana symbols or non-mana costs like tapping or sacrificing. Remember that the reduction only applies to mana; it won't help you with abilities that cost zero mana or only require tapping a creature.

When to Play It

Training Grounds is most effective in decks featuring creatures with repeatable mana-intensive abilities. Because it costs only {U}, it can be deployed early to facilitate explosive turns. It is particularly potent with 'mana sink' creatures or abilities that involve {X} in their activation cost, allowing you to get much larger effects for a fraction of the intended price.

Interaction examples

Conjuring the Grounds

Trackhand Trainer

Training Grounds

If you use Trackhand Trainer to conjure a Training Grounds, the trainer's first ability now changes. Instead of paying {3}{U}{U} to draw a card, you only pay {1}{U}{U}. The {2} reduction applies to the generic mana, and because the total cost still includes two blue mana, it does not violate the 'at least one mana' rule.

The One Mana Limit

Training Grounds

If you control a creature with an ability that costs {2}, Training Grounds will reduce that cost. However, because the effect cannot reduce the mana cost to less than one mana, you must still pay {1} to activate the ability. If the cost were {2}{U}, you would only pay {U}.

Non-Creature Permanents

Urza's Saga

Training Grounds

Urza's Saga gains an ability to create a Construct token for {2}. Even if you control Training Grounds, this cost is not reduced. Training Grounds only affects 'creatures you control,' and Urza's Saga is an Enchantment Land, not a creature.

Guide written with AI from the official text and rulings. Official English text prevails.

How it works : Training Grounds

Original English text — Wizards of the Coast / Scryfall

#1October 2, 2025· Wizards of the Coast
Training Grounds affects only creatures you control on the battlefield. The costs of activated abilities that work in other zones (such as cycling or unearth) won't be reduced.
No other card is named in this ruling.
#2October 2, 2025· Wizards of the Coast
Training Grounds can reduce the amount you pay for a creature's activated ability cost that includes . For example, Drana, Kalastria Bloodchief has an activated ability that costs . If you control Training Grounds and you activate the ability with X equal to 5, you'll have to pay only . This is true even if the ability states that must be paid with a certain color of mana, as Crimson Hellkite's ability does.
No other card is named in this ruling.
#3October 2, 2025· Wizards of the Coast
Training Grounds takes the total cost to activate a creature's activated ability into account, not just the cost printed on it. For example, Urabrask has an activated ability that costs , and Suppression Field says "Activated abilities cost more to activate unless they're mana abilities." Since activating Urabrask's activated ability would now cost , Training Grounds reduces that cost back to .
No other card is named in this ruling.
#4October 2, 2025· Wizards of the Coast
If an activated ability of a creature you control costs no generic mana to activate (for example, if it costs , it costs , or it costs only nonmana actions such as or "Sacrifice a creature"), Training Grounds simply won't affect it. In particular, it won't increase the cost to include a mana payment of .
No other card is named in this ruling.
#5October 2, 2025· Wizards of the Coast
Training Grounds reduces the generic mana in waterbend costs for activated abilities. It will not reduce waterbend costs that are additional costs for casting spells.
No other card is named in this ruling.
#6October 2, 2025· Wizards of the Coast
Training Grounds won't affect the part of an activation cost represented by colored mana symbols or snow mana symbols. It also won't affect nonmana parts of an activation cost, if there are any.
No other card is named in this ruling.
#7October 2, 2025· Wizards of the Coast
Training Grounds can reduce the part of an activation cost represented by generic mana symbols down to nothing, as long as it still costs at least one mana. For example, if an activation cost is , you'd have to pay only . If an activation cost is , though, you'd still have to pay .
No other card is named in this ruling.
#8June 15, 2010· Wizards of the Coast
Training Grounds won't affect a cost that isn't the cost to activate a creature's activated ability. For example, it won't affect Flameblast Dragon's cost, since that's a cost paid when a triggered ability resolves, and it won't affect a kicker cost, since that's an additional cost to cast a spell. Activated ability costs appear before a colon (:) in a card's rules text, or, in the case of some keywords, before a colon in reminder text.
No other card is named in this ruling.