Lurking Chupacabra

Oracle Text

Whenever a creature you control explores, target creature an opponent controls gets -2/-2 until end of turn.

Card Rulings

9/29/2017 You don’t choose a target for Lurking Chupacabra’s ability until after your creature has finished exploring.
9/29/2017 If a resolving spell or ability instructs a specific creature to explore but that creature has left the battlefield, the creature still explores. Effects that trigger when a creature you control explores, such as that of Lurking Chupacabra, trigger if appropriate.