Cheapest priced copy (Ikoria: Lair of Behemoths): $1.79 at Card Kingdom, near mint, their price list as of .
Sea-Dasher Octopus 
Creature — Octopus · 2/2 · Rare · Ikoria: Lair of Behemoths Promos · #66p
Mutate {1}{U} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Flash
Whenever this creature deals combat damage to a player, draw a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $1.79 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 66 | Rare | $1.79 | $2.49 |
| Ikoria: Lair of Behemoths | 286 | Rare | $2.29 | $6.99 |
| Ikoria: Lair of Behemoths Promos | 66p | Rare | $2.79 | $3.49 |
| Ikoria: Lair of Behemoths Promos | 66s | Rare | — | $3.49 |