Vorstoß ins Unbekannte

Eine Kreatur deiner Wahl, die du kontrollierst, erkundet. (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 die Kreatur und lege dann die Karte zurück oder auf deinen Friedhof.)
Du darfst in diesem Zug ein zusätzliches Land spielen.

Entrar en lo desconocido

La criatura objetivo que controlas 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 la criatura y luego devuelve la carta a su sitio o ponla en tu cementerio.)
Puedes jugar una tierra adicional este turno.

Saut dans l'inconnu

Une créature ciblée que vous contrôlez 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 la créature, puis remettez la carte au-dessus de votre bibliothèque ou mettez-la dans votre cimetière.)
Vous pouvez jouer un terrain supplémentaire ce tour-ci.

Addentrarsi nell'Ignoto

Una creatura bersaglio che controlli esplora. (Rivela la prima carta del tuo grimorio. Se è una terra, aggiungila alla tua mano. Altrimenti, metti un segnalino +1/+1 sulla creatura, poi rimetti la carta al suo posto o mettila nel tuo cimitero.)
Puoi giocare una terra addizionale in questo turno.

未踏地への進入

あなたがコントロールしているクリーチャー１体を対象とする。それは探検を行う。（あなたのライブラリーの一番上のカードを公開する。それが土地であるなら、そのカードをあなたの手札に加える。そうでないなら、そのクリーチャーの上に＋１/＋１カウンターを１個置き、その後、そのカードを戻すかあなたの墓地に置く。）
このターン、あなたは追加の土地を１つプレイしてもよい。

미지로의 진입

당신이 조종하는 생물을 목표로 정한다. 그 생물은 탐험을 한다. (당신의 서고 맨 위의 카드를 공개한다. 그 카드가 대지라면 그 카드를 당신의 손으로 가져간다. 그렇지 않으면, 그 생물에 +1/+1 카운터 한 개를 올려놓은 후, 그 카드를 서고에 다시 올려놓거나 당신의 무덤에 넣는다.)
당신은 이번 턴에 대지 한 개를 추가로 플레이할 수 있다.

Adentrar o Desconhecido

A criatura alvo que você controla explora. (Revele o card do topo de seu grimório. Coloque aquele card em sua mão se ele for um terreno. Caso contrário, coloque um marcador +1/+1 na criatura e, em seguida, devolva o card ao grimório ou coloque-o em seu cemitério.)
Você pode jogar um terreno adicional neste turno.

Шаг в Неизвестность

Целевое существо под вашим контролем использует Разведку. (Покажите верхнюю карту вашей библиотеки. Если та карта является землей, положите ее в вашу руку. В противном случае положите на то существо один жетон +1/+1, затем положите ту карту назад или положите ее на ваше кладбище.)
Вы можете разыграть одну дополнительную землю в этом ходу.

踏入迷境

令目标由你操控的生物勘察。（展示你的牌库顶牌。如果该牌是地，则置于你手上。若否，则在该生物上放置一个+1/+1指示物，然后将所展示的牌放回原位或置入你的坟墓场。）
你本回合可以额外使用一个地。

令目標由你操控的生物勘察。（展示你的牌庫頂牌。如果該牌是地，則置於你手上。若否，則在該生物上放置一個+1/+1指示物，然後將所展示的牌放回原位或置入你的墳墓場。）
你本回合可以額外使用一個地。

Enter the Unknown

Target creature you control 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 the creature, then put the card back or put it into your graveyard.)
You may play an additional land this turn.

Rivals of Ixalan

Enter the Unknown's effect allows you to play an additional land during your main phase. Doing so follows the normal timing rules for playing lands.

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.

If the target creature is an illegal target by the time Enter the Unknown tries to resolve, the spell doesn't resolve. It won't explore, and you won't be able to play an additional land.

If you somehow manage to cast Enter the Unknown when it's not your turn, the target creature explores when it resolves, but you won't be able to play a land that turn.

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.

The effects of multiples of Enter the Unknown in the same turn are cumulative. They're also cumulative with other effects that let you play additional lands, such as the one from Wayward Swordtooth.