Send to Certain Doom

Whenever an effect would put one or more
+1/+1 counters on a permanent this turn, put that many -1/-1 counters on that permanent instead.
Target creature explores. (That creature's controller reveals the top card from his or her library. That player may put that card into his or her hand if
it's a land. Otherwise, that player puts a +1/+1 counter on the creature, then either puts the card back, or puts it into his or her graveyard.)