Ratadrabik of Urborg + Boonweaver Giant + In Bolas's Clutches + Phyrexian Altar

Ratadrabik of Urborg

Boonweaver Giant

In Bolas's Clutches

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 In Bolas's Clutches, 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 In Bolas's Clutches from your graveyard to the battlefield attached to the token.
4. Repeat.