Seegal the Scheming

{w}{u}{b}{t}: Create X tapped 1/1 seagull tokens
with flying where X is the highest CMC among
non-creature permanents on the battlefield.
When Seegal attacks, target a nonland,
noncreature permanent defending opponent
controls. Flip a coin for each seagull attacking
that player & if the number of heads exceed the
CMC of the target permanent, gain control of it.