Enduring Renewal + Ornithopter + Intruder Alarm + Gríma Wormtongue

Enduring Renewal

Ornithopter

Intruder Alarm

Gríma Wormtongue

How it works

1. Activate Grima Wormtongue by tapping it and sacrificing Ornithopter.
2. When Ornithopter dies, Enduring Renewal triggers, returning Ornithopter from your graveyard to your hand.
3. Resolve the Grima Wormtongue ability, causing target player to lose 1 life.
4. Cast Ornithopter by paying 0.
5. Repeat.

This elegant loop turns the zero-mana artifact into an infinite engine of doom by exploiting Enduring Renewal's replacement and graveyard triggers, which immediately bounce Ornithopter right back to your hand every time it hits the dirt. To keep the machinery running, Gríma Wormtongue provides the sacrifice outlet that feeds the Ornithopter to the graveyard while draining life from your foes, and Intruder Alarm untaps Gríma Wormtongue with every new creature entrance so you can repeat the process indefinitely.