Moulder-Wood Mud-Wurm

Expel {6} (If you would roll this card from the Chaos
Library, instead, exile it. As long as itremains exiled,
you may cast it for it's expel cost)
Moulder-Wood Mud-Wurm gets +1/+1 for each untapped creature your opponent's control.
Whenever Moulder-Wood Mud-Wurm attacks, it
gains trample until end of turn. Untap any
number of target creatures you don't control.