Cleric Class + Herd Baloth + Prosperous Innkeeper

Cleric Class

Herd Baloth

Prosperous Innkeeper

How it works

1. Gain life.
2. Cleric Class triggers, putting a +1/+1 counter on Herd Baloth.
3. Herd Baloth triggers, creating a creature token.
4. When the creature token enters the battlefield, Prosperous Innkeeper triggers, causing you to gain 2 life.
5. Repeat from step 2.

This wonderful loop begins humming once you manage any initial life gain, which Cleric Class supercharges with its passive replacement effect to kickstart the engine. That extra life triggers the Level 2 ability of Cleric Class to drop a +1/+1 counter onto Herd Baloth, which in turn answers the counter by spawning a 4/4 Beast token. As that new token hits the board, Prosperous Innkeeper notices the creature entering and hands you life to seamlessly restart the entire cycle.