Tiefsee-Echo

Kreatur — Meervolk, Geist

Zu Beginn des Kampfes in deinem Zug erkundet das Tiefsee-Echo. Dann kannst du es bis zum Ende des Zuges zu einer Kopie einer anderen Kreatur, die du kontrollierst, werden lassen. (Um diese Kreatur erkunden zu lassen, decke die oberste Karte deiner Bibliothek auf. Falls die Karte ein Land ist, nimm sie auf deine Hand. Lege sonst eine +1/+1-Marke auf diese Kreatur und lege dann die Karte zurück oder auf deinen Friedhof.)

4/4
standard future historic gladiator pioneer explorer modern legacy pauper vintage penny commander brawl alchemy paupercommander duel oldschool premodern
Rulings

Once Deepfathom Echo becomes a copy of another creature, it no longer has its triggered ability until end of turn.
Once an ability that causes a creature to explore begins to resolve, no player may take any other actions until it's done. Notably, opponents can't try to remove the exploring creature after you reveal a nonland card but before it receives a counter.
In some unusual cases, noncreature permanents may explore. For example, if the creature card returned by Defossilize is somehow not a creature once it's on the battlefield, it can still explore. You'll take all the same actions, and you may end up putting a +1/+1 counter on the permanent. (Note that some effects target a creature, and those effects would still require a legal target to have it explore.)
If an ability instructs a creature to explore, its controller reveals the top card of their library. If it's a land card, they'll put it into their hand. Otherwise, they'll put a +1/+1 counter on that creature, then choose to either leave that card on top of their library or put it into their graveyard.
If a resolving spell or ability instructs a specific creature to explore but that creature has left the battlefield, the creature still explores. If you reveal a nonland card this way, you won't put a +1/+1 counter on anything, but you may put the revealed card into your graveyard. Effects that trigger "whenever a creature explores" trigger as appropriate.
Once Deepfathom Echo becomes a copy of another creature, it no longer has its triggered ability until end of turn.
Once an ability that causes a creature to explore begins to resolve, no player may take any other actions until it's done. Notably, opponents can't try to remove the exploring creature after you reveal a nonland card but before it receives a counter.
In some unusual cases, noncreature permanents may explore. For example, if the creature card returned by Defossilize is somehow not a creature once it's on the battlefield, it can still explore. You'll take all the same actions, and you may end up putting a +1/+1 counter on the permanent. (Note that some effects target a creature, and those effects would still require a legal target to have it explore.)
If an ability instructs a creature to explore, its controller reveals the top card of their library. If it's a land card, they'll put it into their hand. Otherwise, they'll put a +1/+1 counter on that creature, then choose to either leave that card on top of their library or put it into their graveyard.
If a resolving spell or ability instructs a specific creature to explore but that creature has left the battlefield, the creature still explores. If you reveal a nonland card this way, you won't put a +1/+1 counter on anything, but you may put the revealed card into your graveyard. Effects that trigger "whenever a creature explores" trigger as appropriate.
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