Mortuary + Cauldron Familiar + Blasting Station + Gwenom, Remorseless

Mortuary

Cauldron Familiar

Blasting Station

Gwenom, Remorseless

How it works

1. Cast Cauldron Familiar either from your hand or from the top of your library by paying or 1 life respectively.
2. When Cauldron Familiar enters, it and Blasting Station trigger.
3. Resolve the Blasting Station trigger, untapping it.
4. Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain 1 life.
5. Activate Blasting Station by tapping it and sacrificing Cauldron Familiar.
6. When Cauldron Familiar dies, Mortuary triggers, putting Cauldron Familiar from your graveyard onto the top of your library.
7. Resolve the Blasting Station ability.
8. Repeat.