Thunderscape Familiar — ruling 1

If a spell is both black and green, you pay {1} less, not {2} less.

Thunderscape Familiar — ruling 2

The generic X cost is still considered generic even if there is a requirement that a specific color be used for it. For example, “only black mana can be spent this way”. This distinction is important for effects which reduce the generic portion of a spell’s cost.

Thunderscape Familiar — ruling 3

This can lower the cost to zero, but not below zero.

Thunderscape Familiar — ruling 5

The lower cost is not optional like with some other cost reducers.

Thunderscape Familiar — ruling 6

Can never affect the colored part of the cost.

Thunderscape Familiar — ruling 7

If this card is sacrificed to pay part of a spell’s cost, the cost reduction still applies.

Thunderscape Familiar : règles, fonctionnement et interactions (MTG)

Thunderscape Familiar 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

First strike Black spells and green spells you cast cost less to cast.

Complete guide

Thunderscape Familiar is a classic cost-reducer from Planeshift that speeds up your game by making your spells more affordable. As a red creature, it specifically targets your black and green spells, allowing you to deploy threats faster than your opponents expect. Beyond its utility, it also holds its own in combat thanks to the first strike keyword.

Efficiency in Motion

Thunderscape Familiar has a static ability that reduces the cost of black spells and green spells you cast by {1}. This reduction applies to the generic mana portion of a spell's total cost. It is important to remember that this effect is mandatory and cumulative; if you control two copies of Thunderscape Familiar, your black and green spells will cost {2} less to cast. However, this ability can never reduce the colored mana requirements of a spell, nor can it reduce a spell's total cost to less than zero mana.

Calculating the Cost

To determine the total cost of a spell, start with the mana cost or an alternative cost (like Flashback), add any cost increases, and finally subtract cost reductions like Thunderscape Familiar's. If you are casting a spell that is both black and green, it still only counts as one spell you are casting, so the cost is reduced by {1}, not {2}. Even if you sacrifice the Familiar to pay for a spell's cost (such as an additional cost), the reduction still applies because the cost was locked in before the sacrifice occurred.

Strategic Implementation

You should play Thunderscape Familiar early in the game to maximize the mana savings over multiple turns. Because it possesses first strike, it serves as an effective deterrent against small aggressive creatures while you build up your resources. It is most effective in decks that rely on casting multiple mid-cost green or black spells, turning four-drops into three-drops and allowing you to cast an extra spell each turn cycle.

Interaction examples

Supporting the Crew

Professional Face-Breaker

Professional Face-Breaker is a red creature. Since Thunderscape Familiar only reduces the cost of black and green spells, Professional Face-Breaker will still cost its full {2}{R} to cast. Thunderscape Familiar's red color identity does not provide a discount to other red cards.

Fixing and Discounting

Ornithopter of Paradise

Ornithopter of Paradise is a colorless artifact creature. Even though it can produce green or black mana, it does not have a color itself. Therefore, Thunderscape Familiar does not reduce its cost. You will still pay {2} generic mana to cast the Ornithopter.

The First Strike Advantage

If Thunderscape Familiar attacks alone, it deals damage during the first strike combat damage step. If it deals enough damage to destroy the blocker, that blocker is removed before it can deal any damage back to the Familiar in the regular combat damage step.

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

How it works : Thunderscape Familiar

Original English text — Wizards of the Coast / Scryfall

#1October 4, 2004· Wizards of the Coast
If a spell is both black and green, you pay less, not less.
No other card is named in this ruling.
#2October 4, 2004· Wizards of the Coast
The generic X cost is still considered generic even if there is a requirement that a specific color be used for it. For example, “only black mana can be spent this way”. This distinction is important for effects which reduce the generic portion of a spell’s cost.
No other card is named in this ruling.
#3October 4, 2004· Wizards of the Coast
This can lower the cost to zero, but not below zero.
No other card is named in this ruling.
#4October 4, 2004· Wizards of the Coast
The effect is cumulative.
No other card is named in this ruling.
#5October 4, 2004· Wizards of the Coast
The lower cost is not optional like with some other cost reducers.
No other card is named in this ruling.
#6October 4, 2004· Wizards of the Coast
Can never affect the colored part of the cost.
No other card is named in this ruling.
#7October 4, 2004· Wizards of the Coast
If this card is sacrificed to pay part of a spell’s cost, the cost reduction still applies.
No other card is named in this ruling.