Bogbrew Witch + Festering Newt + Mortuary + Ashnod's Altar + Thornbite Staff

Bogbrew Witch

Festering Newt

Mortuary

Ashnod's Altar

Thornbite Staff

How it works

1. Activate Bogbrew Witch by paying 2 and tapping it, searching your library for Festering Newt and putting it onto the battlefield.
2. Activate Ashnod's Altar by sacrificing Festering Newt, adding CC.
3. When Festering Newt dies, it, Bogbrew Witch and Mortuary trigger.
4. Resolve the Festering Newt trigger, giving any creature an opponent controls -4/-4 until end of turn.
5. Resolve the Mortuary trigger, putting Festering Newt on top of your library from your graveyard.
6. Resolve the Bogbrew Witch trigger, untapping it.
7. Repeat.