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Legality
| Format | Legality |
| 1v1 Commander | Legal |
| Alchemy | Legal |
| Arena | Legal |
| Block Constructed | Legal |
| Brawl | Legal |
| Canadian Highlander | Legal |
| Casual | Legal |
| Commander / EDH | Legal |
| Commander: Rule 0 | Legal |
| Custom | Legal |
| Duel Commander | Legal |
| Gladiator | Legal |
| Highlander | Legal |
| Historic | Legal |
| Legacy | Legal |
| Leviathan | Legal |
| Limited | Legal |
| Modern | Legal |
| Oathbreaker | Legal |
| Pioneer | Legal |
| Pre-release | Legal |
| Standard | Legal |
| Vintage | Legal |
Deepfathom Echo
Creature — Merfolk Spirit
At the beginning of combat on your turn, Deepfathom Echo explores. Then you may have it become a copy of another creature you control until end of turn. (To have it explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.)
