Kiora, Sovereign of the Deep
Legendary Creature — Merfolk Noble
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.
- CMC
- 5
- Mana cost
- Color identity
- GU
- Rarity
- mythic
- Set
- March of the Machine: The Aftermath
- Price
- $4.72
- EDHREC rank
- #8425
Kiora, Sovereign of the Deep lands and immediately starts cheating Sea Creatures and Krakens into play off the top of your library whenever you cast one — that snowball gets out of hand fast. The cost is a seven-mana planeswalker with no protection and a loyalty-drain ability that demands you already have a critical mass of large sea creatures to exploit; in the wrong shell, she's a do-nothing threat that eats removal before the first trigger.
Best Commanders
Commanders with the highest synergy
Arixmethes, Slumbering Isle
Arixmethes, Slumbering Isle is itself a Kraken, so the two cards share a type-line synergy on top of the obvious Simic color overlap — Kiora, Sovereign of the Deep rewards every sea creature cast with a free cascade-style reveal, and Arixmethes decks are already stacking the library with enormous aquatic threats that make each trigger explosive.
Kenessos, Priest of Thassa
Kenessos, Priest of Thassa puts Krakens and sea creatures directly onto the battlefield from the top of the library, feeding the exact permanent types Kiora, Sovereign of the Deep wants in play — the two create a self-reinforcing loop where each creature deployed from the top increases the odds the next trigger hits another free creature.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | legal |
| standard | not legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
Commander is where Kiora, Sovereign of the Deep belongs — the 100-card singleton format gives her enough time to set up, and sea creature tribal lists have the density of Krakens, Leviathans, and Serpents she needs to make her static ability matter. In competitive 60-card formats like Modern and Pioneer she's legal but unplayable; seven mana for a planeswalker with conditional upside is nowhere near the speed those formats demand. Legacy and Vintage are theoretically available but offer the same verdict — no serious shell wants her there. Oathbreaker is the one other format where she has a real home, potentially as the planeswalker herself in a sea creature list built around her passive.
Key Combos
Combo lines featuring this card
Price Context
Current price
$4.72 cheap tier
At $4.72, Kiora, Sovereign of the Deep sits in the cheap tier — low enough that including her in a thematic sea creature build is a no-brainer budget decision. That price reflects her narrow tribal demand rather than any broader appeal, so don't expect significant movement unless a new Kraken payoff pushes the archetype into wider play.
Explore
Sources
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.