Katara, Water Tribe's Hope 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
Vigilance When Katara enters, create a 1/1 white Ally creature token. Waterbend: Creatures you control have base power and toughness X/X until end of turn. X can't be 0. Activate only during your turn. (While paying a waterbend cost, you can tap your artifacts and creatures to help. Each one pays for
.)
Complete guide
Katara, Water Tribe's Hope brings the tactical flow of the Water Tribe to Magic: The Gathering, turning your entire board into a source of energy. This legendary Ally excels at leading an army by transforming small tokens into massive threats through the power of Waterbend. Mastering her means understanding how to balance your board presence with your mana resources.
Understanding Waterbend
Waterbend is a keyword ability that functions as a cost-reduction mechanic similar to Convoke or Improvise. When activating Katara's ability, for every {1} in the {X} cost, you may tap an untapped artifact or creature you control to pay for it. Notably, this includes the creature with Waterbend itself and any artifacts you control. Because this is a cost payment, you can even tap creatures with 'summoning sickness' to pay for Waterbend, as the {T} symbol is not part of the ability's cost.
Step-by-Step Resolution
First, announce the value for X and declare the activation of Katara's ability during your turn. Second, determine the total cost, which is simply {X}. Third, pay the cost by either spending mana or tapping untapped artifacts and creatures you control. Once the ability resolves, every creature you control has its base power and toughness set to X/X. This overwrites their original stats but does not remove any +1/+1 counters or other continuous bonuses that aren't 'base' power effects.
Common Mistakes
A frequent error is trying to double-dip with mana abilities. If you tap an artifact like a Mana Vault for mana, it is already tapped and cannot be used to pay for Waterbend. Additionally, remember that Katara's ability only sets the 'base' stats. If a creature has three +1/+1 counters and you set X to 5, that creature will be an 8/8 (5/5 base plus the counters). Finally, keep in mind that X cannot be 0; you must choose a value of at least 1.
When to Play Katara
Katara is most effective in decks that go wide with tokens or low-cost artifacts. Since she creates an Ally token upon entering, she immediately provides two bodies that can be used for Waterbend on a subsequent turn. She is best used as a finisher during your combat phase to surprise opponents with a sudden surge in your creatures' sizes after they have declared blockers or to make your small utility creatures relevant in combat.
Interaction examples
When Katara, Water Tribe's Hope enters the battlefield, her triggered ability creates a 1/1 white Ally creature token. If you have four mana available and want to use Waterbend where X=4, you can tap Katara and the Ally token to pay {2} of that cost, only needing to spend {2} actual mana from your lands.
With Roaming Throne on the battlefield naming 'Ally', Katara's enters-the-battlefield ability triggers twice, giving you two 1/1 Ally tokens instead of one. Later, when you activate Waterbend, the Roaming Throne (being an artifact creature) can be tapped to help pay for the {X} cost, and it will also have its base power and toughness changed to X/X upon resolution.
You control Katara and Solemn Simulacrum. You decide to activate Waterbend for X=5. You tap Solemn Simulacrum and Katara to pay {2} of the cost and spend {3} mana. Even though Solemn Simulacrum is a 2/2, it becomes a 5/5 base creature until end of turn. If it dies later in combat, you still get to draw your card from its triggered ability.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Katara, Water Tribe's Hope
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Even if the cost of the spell or ability that waterbend is part of increases or decreases, you still may only tap artifacts or creatures to pay for costs up to the amount of the generic mana in the waterbend cost.
No other card is named in this ruling.
- #2· Wizards of the Coast
Katara, Water Tribe's Hope's ability overwrites any effects that previously set a creature's base power and/or toughness. Any existing effects or counters that raise or lower a creature's power and/or toughness continue to apply.
No other card is named in this ruling.
- #3· Wizards of the Coast
If a waterbend cost is part of the total cost to cast a spell or activate an ability, you may tap an untapped artifact or creature you control rather than pay one generic mana in that total cost any number of times up to a maximum of the amount of generic mana in the waterbend component of that total cost.
No other card is named in this ruling.
- #4· Wizards of the Coast
"Waterbend [cost]" means "Pay [cost]. For each generic mana in that cost, you may tap an untapped artifact or creature you control rather than pay that mana."
No other card is named in this ruling.
- #5· Wizards of the Coast
If an artifact or creature you control has a mana ability with
in the cost, activating that ability while casting a spell or activating an ability with waterbend will result in the artifact or creature being tapped before you pay the spell's costs. You won't be able to tap it again for waterbend. Similarly, if you sacrifice an artifact or creature to activate a mana ability to pay a cost with waterbend, that artifact or creature won't be on the battlefield when you pay the spell's costs, so you won't be able to tap it for waterbend.
No other card is named in this ruling.
- #6· Wizards of the Coast
You can tap any untapped creature or artifact you control to pay a waterbend cost, even one you haven't controlled continuously since the beginning of your most recent turn.
No other card is named in this ruling.
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Katara, Water Tribe's Hope
Ally
Roaming Throne
Solemn Simulacrum