Kiora, Sovereign of the Deep #85
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Card Details
Vigilance, ward 
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.
4/5
Illustrated by Dominik Mayer
Rulings (3)
May 12, 2023
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.
May 12, 2023
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.
May 12, 2023
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.
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