Kiora, Sovereign of the Deep

three generic mana one green mana one blue mana Legendary Creature — Merfolk NoblePower and toughness4/5

Vigilance, ward three generic mana

Whenever you cast a Kraken, Leviathan, Octopus, or Serpent spell from your hand, look at the top X cards of your library, where X is that spell's mana value. You may cast a spell with mana value less than X from among them without paying its mana cost. Put the rest on the bottom of your library in a random order.

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Showing March of the Machine: The Aftermath#35

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2.68 $

Foil 3.75 $

30 printings · up to 7.16 $

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Kiora, Sovereign of the Deep rulings

2023-05-12
The spell you cast without paying its mana cost is cast during the resolution of the triggered ability. Timing restrictions of that spell based on card type are ignored. It will resolve before the spell that caused the ability to trigger.
2023-05-12
If you cast a spell "without paying its mana cost," you can't pay any alternative costs. You can, however, pay additional costs. If the spell has any mandatory additional costs, those must be paid to cast it.
2023-05-12
If the spell has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

Kiora, Sovereign of the Deep keyword rules

Vigilance Rule 702.20

Vigilance is a static ability that modifies the rules for the declare attackers step.

Attacking doesn’t cause creatures with vigilance to tap. (See rule , “Declare Attackers Step.”)

Multiple instances of vigilance on the same creature are redundant.

Ward Rule 702.21

Ward is a triggered ability. Ward [cost] means “Whenever this permanent becomes the target of a spell or ability an opponent controls, counter that spell or ability unless that player pays [cost].”

Some ward abilities include an X in their cost and state what X is equal to. This value is determined at the time the ability resolves, not locked in as the ability triggers.