Verdant Succession + Elvish Soultiller + Phyrexian Altar

Verdant Succession

Elvish Soultiller

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Elvish Soultiller, adding one mana of any color.
2. Elvish Soultiller dies, triggering itself and Verdant Succession.
3. Resolve the Elvish Soultiller trigger, shuffling all Elves or Mutants from your graveyard into your library.
4. Resolve the Verdant Succession trigger, searching your library for Elvish Soultiller, putting it onto the battlefield and shuffling your library.
5. Repeat.