Meervolk-Wipfelstürmerin

Wenn die Meervolk-Wipfelstürmerin ins Spiel kommt, erkundet sie. (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.)

Tritón cruzarramas

Cuando la Tritón cruzarramas entre, explora. (Muestra la primera carta de tu biblioteca. Pon esa carta en tu mano si es una tierra. De lo contrario, pon un contador +1/+1 sobre esta criatura y luego devuelve la carta a su sitio o ponla en tu cementerio.)

Marchebranche ondine

Quand la Marchebranche ondine arrive, elle explore. (Révélez la carte du dessus de votre bibliothèque. Mettez cette carte dans votre main si c'est un terrain. Sinon, mettez un marqueur +1/+1 sur cette créature, puis remettez la carte au-dessus de votre bibliothèque ou mettez-la dans votre cimetière.)

Tritona Calcafronde

Quando la Tritona Calcafronde entra, esplora. (Rivela la prima carta del tuo grimorio. Se è una terra, aggiungila alla tua mano. Altrimenti, metti un segnalino +1/+1 su questa creatura, poi rimetti quella carta al suo posto o mettila nel tuo cimitero.)

マーフォークの枝渡り

マーフォークの枝渡りが戦場に出たとき、これは探検を行う。（あなたのライブラリーの一番上にあるカード１枚を公開する。それが土地なら、そのカードをあなたの手札に加える。そうでないなら、このクリーチャーの上に＋１/＋１カウンター１個を置く。その後、そのカードを戻すかあなたの墓地に置く。）

Merfolk Branchwalker

When Merfolk Branchwalker enters, it explores. (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.)

Foundations Jumpstart

Ixalan

When Merfolk Branchwalker enters the battlefield, it explores. (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.)

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.

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 you control explores" trigger if appropriate.

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 no card is revealed, most likely because that player's library is empty, the exploring creature receives a +1/+1 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.)

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.

Some spells or abilities might cause a creature to explore multiple times in a row. If you reveal a nonland card when a creature explores and leave it on top of your library, then the creature explores again immediately afterwards, you'll reveal the same card again.