Myrkul, Lord of Bones + Verdant Succession + Riftsweeper + Ashnod's Altar

Myrkul, Lord of Bones

Verdant Succession

Riftsweeper

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Riftsweeper, adding CC.
2. Riftsweeper dies, triggering Verdant Succession and Myrkul.
3. Resolve the Myrkul trigger, causing you to exile Riftsweeper and create a token copy of Riftsweeper that is an enchantment and loses all other card types.
4. The Riftsweeper token enters the battlefield, shuffling the nontoken Riftsweeper into your library from exile.
5. Resolve the Verdant Succession trigger from step 2, searching your library for Riftsweeper and putting it onto the battlefield.
6. Riftsweeper enters the battlefield, shuffling any exiled card into its owner's library.
7. Repeat.