The River Heralds found clues to a grand heritage below Ixalan's surface.

Die Flussherolde fanden Hinweise auf ein bedeutsames Erbe unter der Oberfläche Ixalans.

Jadelicht-Höhlenforscher

Wenn der Jadelicht-Höhlenforscher ins Spiel kommt, erkundet er X Mal.

Les Hérauts de l'onde découvrirent les indices d'un important héritage sous la surface d'Ixalan.

Spéléologue jadefeu

Quand le Spéléologue jadefeu arrive sur le champ de bataille, il explore X fois.

川守り達はイクサランの地下深くに眠りし大いなる遺産の痕跡を見つけた。

翡翠光の洞窟探検家

翡翠光の洞窟探検家が戦場に出たとき、これはＸ回探検を行う。

川流使发现的线索表明，依夏兰地表之下尚有一处宏伟遗迹等待发掘。

玉光探窟员

当玉光探窟员进战场时，令它勘察X次。

Jadelight Spelunker

When this creature enters, it explores X times. (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.)

The Lost Caverns of Ixalan Promos

The Lost Caverns of Ixalan

When Jadelight Spelunker enters the battlefield, it explores X times. (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.)

When Jadelight Spelunker enters the battlefield, it explores X times.

If Jadelight Spelunker enters the battlefield without being cast, or if it was cast with X equal to 0, the enters-the-battlefield ability will still trigger, but Jadelight Spelunker won't explore at all.

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 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.