Spike Feeder + Cleric Class

Prerequisites

Cleric Class is at least level two. Spike Feeder has at least two +1/+1 counters on it.

Steps

1. Activate Spike Feeder by removing a +1/+1 counter from it to gain two life.
2. Cleric Class triggers, putting a +1/+1 counter on Spike Feeder.
3. Repeat.