Disco Zombie

At the beginning of your combat phase,
start playing a song you deem epic enough
for this battle (e.g. on your phone). As long
as that song plays, creatures you control get
+2/+0. When that song ends, put a -1/-1
counter on each untapped creature.
Use this ability only anytime no other
Disco Zombie music is playing.
"Hit it, boys!"
by PBRunny