Den, The fun

+1: Put a +1+1 counter on target creature it gains first strike until end of turn
-4: Den, the fun becomes a 3/3 legendary creature with trample, haste and first strike
-8: you get an elbumb with "Whenever you draw 1 or more cards wave = to how many cards you drew" (To wave put a +1+1 counter on a blue creature)