Enduring Renewal + Barrage Ogre + Intruder Alarm + Ornithopter

Enduring Renewal

Barrage Ogre

Intruder Alarm

Ornithopter

How it works

1. Activate Barrage Ogre by tapping it and sacrificing Ornithopter.
2. When Ornithopter dies, Enduring Renewal triggers, returning Ornithopter from your graveyard to your hand.
3. Resolve the Barrage Orge ability, dealing 2 damage to any target.
4. Cast Ornithopter by paying 0.
5. Repeat.

This clever loop turns free, zero-mana artifacts into a lethal barrage by manipulating the graveyard and the battlefield all at once. When you activate Barrage Ogre, you sacrifice Ornithopter to deal damage, which immediately triggers Enduring Renewal to slide Ornithopter right back into your hand rather than letting it stay in the yard. Replaying that free Ornithopter for zero mana then triggers Intruder Alarm, which untaps Barrage Ogre so you can repeat the process and melt your opponents' life totals away.