Ratadrabik of Urborg + Gollum, Patient Plotter + Altar of Dementia

Ratadrabik of Urborg

Gollum, Patient Plotter

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing Gollum.
2. When Gollum dies, it and Ratadrabik trigger.
3. Resolve the Ratadrabik trigger, creating a nonlegendary token copy of Gollum that is a 2/2 Zombie in addition to its other types.
4. Resolve the Gollum trigger from step 2, causing the Ring to tempt you, and for the Gollum token to become your Ring-bearer, thus making it legendary.
5. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Gollum's power.
6. Repeat.