Fizz

Ward X, where X is the number of instants and sorceries you've cast this turn as this ability resolves
Whenever you cast an instant or sorcery, Fizz gains skulk until the end of the turn and you gain an experience counter
Whenever Fizz deals combat damage to an opponent, if you have 6 or more experience counters, you may pay {4}. If you do, create Longtooth, a legendary 4/3 blue creature token