Kiora, Sovereign of the Deep — ruling 1

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.

Kiora, Sovereign of the Deep — ruling 2

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.

Kiora, Sovereign of the Deep — ruling 3

If the spell has {X} 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 : règles, fonctionnement et interactions (MTG)

Kiora, Sovereign of the Deep 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, 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.

Complete guide

Kiora, Sovereign of the Deep is a powerhouse commander that rewards you for playing the massive monsters of the ocean. By turning your high-cost sea creatures into two-for-one plays, she ensures you dominate the board state while keeping your hand full. With vigilance and ward {3}, she is also surprisingly difficult for your opponents to remove.

Unlocking the Depths

Whenever you cast a Kraken, Leviathan, Octopus, or Serpent spell from your hand, Kiora triggers. You look at the top X cards of your library, where X is the mana value of the spell you just cast. You can then choose one spell from those cards with a lower mana value than X and cast it for free. The rest of the cards are tucked away at the bottom of your library in a random order.

Resolution Step-by-Step

First, you cast your sea monster from your hand and pay its costs. Kiora's ability triggers and goes on top of the stack. When the ability resolves, you look at the library cards and choose a spell to cast. This happens immediately during the resolution, meaning you ignore normal timing restrictions (like casting a creature during an opponent's turn). This free spell then goes on the stack above your original monster, meaning the free spell will resolve first.

Common Pitfalls

Remember that Kiora only triggers if the spell is cast from your hand; blinking a creature or returning it from the graveyard won't work. If you choose a spell with {X} in its mana cost for the free cast, X must be zero. Additionally, while you can't pay alternative costs (like Mutate), you must still pay mandatory additional costs if the spell requires them.

When to Play Kiora

Kiora is best played when you have at least one high-cost sea monster ready in your hand for the following turn. Because her ability provides card advantage and tempo, you want to protect her using her Ward {3} and ensure you have enough mana to start the chain of spells that will overwhelm your opponents.

Interaction examples

Doubling the Harvest

Roaming Throne

If Roaming Throne is on the battlefield with 'Noble' or 'Merfolk' chosen, Kiora's ability triggers twice. When you cast a large Serpent, you will look at the top X cards twice, potentially casting two free spells before your Serpent even hits the battlefield.

Finding Utility

Solemn Simulacrum

If you cast a Sea Monster with a mana value of 5 or greater, you might find Solemn Simulacrum among the top cards. You can cast the Simulacrum for free, allowing you to ramp a land onto the battlefield before your original creature spell resolves.

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

How it works : Kiora, Sovereign of the Deep

Original English text — Wizards of the Coast / Scryfall

#1May 12, 2023· Wizards of the Coast
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.
No other card is named in this ruling.
#2May 12, 2023· Wizards of the Coast
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.
No other card is named in this ruling.
#3May 12, 2023· Wizards of the Coast
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.
No other card is named in this ruling.