Blood Thirsty Berserker

Whenever the second spell is cast in a turn, if
Blood Thirsty Berserker is human, it becomes
a werewolf and gets +2/+2 and gains trample.
If Blood Thirsty Berserker is a werewolf, it
becomes monstrous and gets three +1/+1
counters. If Blood Thirsty Berserker is
monstrous it gains rampage 4. (Whenever this
creature becomes blocked, it gets +4/+4 until end
of turn for each creature blocking it beyond the first.)