Pouncing Goalion

First Strike
Pounce (You may cast this card any time you could cast an Instant for {1}{g/w}{g/w}{g/w}. If you do, return it to your hand at the beginning of the next end step.)
If you cast Pouncing Goalion during an opponent's turn, it may fight target creature that player controls, otherwise it enters the battlefield with a +1/+1 counter on it.
"It hides in the tall grass with it's horns sticking out like the fin of a shark, warning it's prey of it's presence mere moments before it strikes."