S.H.I.E.L.D. Heilcarrier

When S.H.I.E.L.D. Heilcarrier enters
the battlefield choose 3 creatures with
power 2 or less. On your next untap
step, if S.H.I.E.L.D Heilcarrier is still on the
battlefield then destroy those 3 creatures.
I know, their a little bit bigger than a 22.