Whenever a player plays a spell that counters a spell that has been played or a player plays a spell that comes into play with counters, that player may counter the next spell played or put an additional counter on a permanent that has already been played, but not countered.

Counter target spell.

Gotcha — If an opponent says "spell" or "counter," you may say "Gotcha" When you do, return Spell Counter from your graveyard to your hand.