Hakbal von der Wogenden Seele

Zu Beginn des Kampfes in deinem Zug erkundet jede Meervolk-Kreatur, die du kontrollierst.
Immer wenn Hakbal von der Wogenden Seele angreift, kannst du eine Länderkarte aus deiner Hand ins Spiel bringen. Falls du dies nicht tust, ziehe eine Karte.

Hakbal de l'Âme déferlante

Au début du combat pendant votre tour, chaque créature Ondin que vous contrôlez explore.
À chaque fois qu'Hakbal de l'Âme déferlante attaque, vous pouvez mettre sur le champ de bataille une carte de terrain de votre main. Si vous ne le faites pas, piochez une carte.

うねる魂のハクバル

あなたのターンの戦闘の開始時に、あなたがコントロールしている各マーフォーク・クリーチャーはそれぞれ探検を行う。
うねる魂のハクバルが攻撃するたび、あなたの手札にある土地・カード１枚を戦場に出してもよい。そうしないなら、カード１枚を引く。

翻涌之魂哈巴尔

在你回合的战斗开始时，令每个由你操控的人鱼勘察。
每当翻涌之魂哈巴尔攻击时，你可以将一张地牌从你手上放进战场。若你未如此作，则抓一张牌。

Hakbal of the Surging Soul

At the beginning of combat on your turn, each Merfolk 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 exploring creature, then put the card back or put it into your graveyard.)
Whenever Hakbal attacks, you may put a land card from your hand onto the battlefield. If you don't, draw a card.

The Lost Caverns of Ixalan Commander

At the beginning of combat on your turn, each Merfolk 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 exploring creature, then put the card back or put it into your graveyard.)
Whenever Hakbal of the Surging Soul attacks, you may put a land card from your hand onto the battlefield. If you don't, draw a card.

At the beginning of combat on your turn, each Merfolk creature you control explores.
Whenever Hakbal of the Surging Soul attacks, you may put a land card from your hand onto the battlefield. If you don't, draw a card.

Each of your Merfolk creatures will explore during the resolution of Hakbal of the Surging Soul's first ability. Players won't be able to respond between the explores.

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 you control multiple Merfolk, you choose the order in which they explore. Make sure it's clear which Merfolk is exploring before you reveal any cards.

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.