The God Fishy

The God-Fishy enters the battlefield with X
+1/+1 counters on it. If X was fifteen or more, it
gains hexproof and indestructible. Otherwise, sacrifice it.
Whenever a blue nontoken, nonland permanent
enters the battlefield, create a 5/5 blue Leviathan creature token with menace.
If you own 100 or more permanents with the
same card name, you win the game.