Battered Ram

Menace, trample
{3}{w}{w}{b}{b}: You may switch Battered Ram's
power and toughness until end of turn. If you do,
it gains indestructible until end of turn.
Whenever Battered Ram becomes blocked, put a
stun counter on each blocking creature.
(If a permanent with a stun counter would
become untapped, remove one from it instead.)