Infinite +1/+1 counters on a creature, Infinite damage, Exile your library with the ability to play the exiled cards until end of turn
Declare Casey as an attacker, triggering its first ability, putting a +1/+1 counter on it.
Casey's second ability triggers, dealing 1 damage to an opponent.
Ob Nixilis triggers, putting a +1/+1 counter on it and exiling the top card of your library with the ability to play it until your end step.
Repeat from step 2.
Component Cards
How It Works
Declare Casey as an attacker, triggering its first ability, putting a +1/+1 counter on it.
Casey's second ability triggers, dealing 1 damage to an opponent.
Ob Nixilis triggers, putting a +1/+1 counter on it and exiling the top card of your library with the ability to play it until your end step.
Repeat from step 2.