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.

Exile your library with the ability to play the exiled cards until end of turn

Infinite +1/+1 counters on a creature

Infinite damage

Casey Jones, Back Alley Brute

Ob Nixilis, Captive Kingpin

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.
The Red Terror triggers, putting a +1/+1 counter on it.
Repeat from step 2.

The Red Terror

Activate Heliod by paying {1}{W}, giving Casey lifelink.
Gain life.
Heliod triggers, putting a +1/+1 counter on Casey.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 3.

Infinite lifegain

Infinite lifegain triggers

Heliod, Sun-Crowned

Gain life.
Archangel of Thune triggers, putting a +1/+1 counter on each creature you control.
Casey triggers, dealing damage to an opponent and causing you to gain that much life due to its lifelink.
Repeat from step 2.

Infinite +1/+1 counters on creatures you control

Archangel of Thune

Gain life.
Heroic Feast triggers, putting a +1/+1 counter on Casey.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 2.

Heroic Feast

Gain life.
Cleric Class triggers, putting a +1/+1 counter on Casey.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 2 life due to its lifelink and Cleric Class
Repeat from step 2.

Cleric Class

Gain life.
The Destined White Mage triggers, putting a +1/+1 counter on Casey.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 2.

The Destined White Mage

Gain life.
Casey triggers, putting a +1/+1 counter on it
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 2.

Light of Promise

Gain life.
Spider-Man triggers, putting a +1/+1 counter on Casey.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 2.

Spider-Man, Peter Parker

Gain life.
Casey triggers, putting a +1/+1 counter on it.
Casey triggers, dealing 1 damage to an opponent and causing you to gain 1 life due to its lifelink.
Repeat from step 2.

Sunbond

Activate Phyrexian Devourer by exiling the top card of your library, putting a number of +1/+1 counters on it equal to the exiled card's mana value.
Casey's second ability triggers, and Phyrexian Devourer triggers if it's power is 7 or greater.
Resolve the Casey trigger, dealing damage to an opponent.
Holding priority, repeat from step 1 until your library.
Resolve all Phyrexian Devourer triggers, sacrificing it.

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