Colfenor, the Last Yew + Tempered Steel + Memnite + Ornithopter + Blasting Station

Colfenor, the Last Yew

Tempered Steel

Memnite

Ornithopter

Blasting Station

How it works

1. Tap Blasting Station, sacrificing Memnite to deal 1 damage to any target.
2. Colfenor triggers, returning Ornithopter from your graveyard to your hand.
3. Cast Ornithopter.
4. Ornithopter enters, triggering Blasting Station untapping it.
5. Tap Blasting Station, sacrificing Ornithopter to deal 1 damage to any target.
6. Colfenor triggers, returning Memnite from your graveyard to your hand.
7. Cast Memnite.
8. Memnite enters, triggering Blasting Station untapping it.
9. Repeat.