Fain, the Broker + Thornbite Staff + Arcane Adaptation + Xathrid Necromancer

Fain, the Broker
Thornbite Staff
Arcane Adaptation
Xathrid Necromancer

Requires
Fain, the Broker must be on the battlefield. Thornbite Staff must be on the battlefield. Arcane Adaptation must be on the battlefield. Xathrid Necromancer must be on the battlefield. You control at least one additional creature. Thornbite Staff attached to Fain. Fain does not have summoning sickness. "Human" chosen with Arcane Adaptation.
Steps
  1. Activate Fain's first ability by tapping it and sacrificing a creature.
  2. When the creature dies, Xathrid Necromancer and Fain trigger.
  3. Resolve the Xathrid Necromancer trigger, creating a 2/2 Zombie creature token.
  4. Resolve the Fain trigger, untapping it.
  5. Resolve the Fain ability from step 1, putting two +1/+1 counters on a creature you control.
  6. Repeat.
Results
Infinite +1/+1 counters. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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