Is Deepfathom Echo legal in Standard, Modern, and Commander?

Deepfathom Echo is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Deepfathom Echo

Q: What type of card is Deepfathom Echo?

Deepfathom Echo is a Creature — Merfolk Spirit. Its oracle text reads: "At the beginning of combat on your turn, this creature explores. Then you may have it become a copy of another creature you control until end of turn. (To have this creature 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 this creature, then put the card back or put it into your graveyard.) Power/Toughness: 4/4"

Creature — Merfolk Spirit

At the beginning of combat on your turn, this creature explores. Then you may have it become a copy of another creature you control until end of turn. (To have this creature 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 this creature, then put the card back or put it into your graveyard.)

Power/Toughness: 4/4

Set The Lost Caverns of Ixalan

Rarity Rare

Mana Value 4

Artist Matt Stewart

Collector # 228

Scryfall