Kiora, Sovereign of the Deep

Kiora is a 4/5 vigilance ward-3 legendary at 5 mana — well-statted and sticky — whose triggered ability fires whenever you cast a Kraken, Leviathan, Octopus, or Serpent from hand, letting you cascade-style cast a free spell with MV less than that creature's MV from the top X cards. In a dedicated sea-monster shell this engine is backbreaking — large sea creatures (MV 7-10+) can free-cast basically anything in your deck. The card is build-around by nature: outside a Simic sea-monster shell it does very little.

• The free spell cast off Kiora's trigger must have mana value strictly less than X (the sea creature's MV), so casting a 7-MV Kraken lets you cast anything up to MV 6 for free — this includes most interaction, ramp, and even other threats.

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• Because the trigger requires casting from hand (not from anywhere), Kiora does not synergize with reanimation lines that cheat sea monsters into play; you must hard-cast or use cost reducers to trigger her.

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• Kiora's ward {3} makes her unusually resilient for a commander/build-around piece — most targeted removal in casual tables costs at least 3 mana and adding the ward tax often causes opponents to pass rather than answer her.

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• EDHREC rank: #8,353