Beast Possessed Soul

Whenever a creature you control dies with a
+1/+1, this card gains a +1/+1 counter for
himself.
Whenever you cast an instant or Sorcery spell,
this card gets +4/0 until the end of the turn.
If the Instant card Beast Curse gets attached to
this card, he gains an additional +2/+0 but loses
an additional -1/0 after the cards effect.