Agente de la reina

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Rulings:

• 1/19/2018 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.
• 1/19/2018 If no card is revealed, most likely because that player’s library is empty, the exploring creature receives a +1/+1 counter.
• 1/19/2018 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.