Ratadrabik of Urborg + Boonweaver Giant + On Serra's Wings + Ashnod's Altar

Ratadrabik of Urborg

Boonweaver Giant

On Serra's Wings

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Boonweaver Giant, adding CC.
2. When Boonweaver Giant dies as a legendary creature due to On Serra's Wings, Ratadrabik of Urborg triggers, creating a token copy of Boonweaver Giant that is a 2/2 Zombie in addition to its other types.
3. When the Boonweaver Giant token enters the battlefield, it triggers, returning On Serra's Wings from your graveyard to the battlefield attached to the token.
4. Repeat.

This clever loop turns Boonweaver Giant into an infinite mana and sacrifice engine by using On Serra's Wings to temporarily make the Giant legendary. Because Ratadrabik of Urborg watches for legendary creatures to die, every time Ashnod's Altar converts the Giant into colorless mana, Ratadrabik immediately replaces it with a nonlegendary Zombie copy. That entering token then triggers On Serra's Wings to reattach itself from the graveyard, setting up the exact same legendary status needed to repeat the cycle.