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

Ratadrabik of Urborg

Boonweaver Giant

On Serra's Wings

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Boonweaver Giant, adding one mana of any color.
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 elegant loop turns a humble giant into an endless engine of sacrifice and resurrection, fueled by Ratadrabik of Urborg granting legendary status to your board. When you attach On Serra's Wings to Boonweaver Giant, it becomes legendary, allowing Ratadrabik of Urborg to notice its demise and spawn a non-legendary Zombie copy whenever it hits the graveyard. Feeding the original giant to Phyrexian Altar provides the initial mana and death, while the newly entering token triggers its own entry ability to fish On Serra's Wings right back out of the graveyard and onto itself. Because the token is also a Zombie, it neatly inherits vigilance from Ratadrabik of Urborg, repeating this cycle indefinitely to yield infinite mana and triggers.