Filigree Familiar + Mortuary + Krark-Clan Ironworks + Cloud Key

Filigree Familiar

Mortuary

Krark-Clan Ironworks

Cloud Key

How it works

1. Activate Krark-Clan Ironworks by sacrificing Filigree Familiar, adding CC.
2. When Filigree Familiar dies, its second ability and Mortuary trigger.
3. Resolve the Mortuary trigger, putting Filigree Familiar on top of your library from your graveyard.
4. Resolve the Filigree Familiar trigger, causing you to draw Filigree Familiar.
5. Cast Filigree Familiar by paying 2.
6. When Filigree Familiar enters the battlefield, its first ability triggers, causing you to gain two life.
7. Repeat.