Karmic Guide + Elesh Norn, Grand Cenobite + Harmless Offering

Karmic Guide

Elesh Norn, Grand Cenobite

Harmless Offering

How it works

1. Cast Harmless Offering by paying 2, giving control of Elesh Norn to an opponent.
2. Cast Karmic Guide by paying 3.
3. Karmic Guide enters the battlefield and dies as a state-based action due to having zero or less toughness.
4. Karmic Guide's enter-the-battleifeld ability triggers, returning Karmic Guide from your graveyard to the battlefield.
5. Repeat from step 3.