Cloudstone Curio + Sadistic Hypnotist + Basking Rootwalla + Blazing Rootwalla + Angelic Sell-Sword

Cloudstone Curio

Sadistic Hypnotist

Basking Rootwalla

Blazing Rootwalla

Angelic Sell-Sword

How it works

1. Activate Sadistic Hypnotist by sacrificing a creature, causing you to discard Basking Rootwalla and Blazing Rootwalla into exile.
2. Basking Rootwalla and Blazing Rootwalla's madness abilities trigger.
3. Resolve the Basking Rootwalla trigger, causing you to pay 0 to cast it from exile.
4. When Basking Rootwalla enters the battlefield, Cloudstone Curio and Angelic Sell-Sword trigger.
5. Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand.
6. Resolve the Angelic Sell-Sword trigger, creating a 1/1 Mercenary creature token.
7. When the creature token enters the battlefield, Cloudstone Curio triggers, returning Basking Rootwalla from the battlefield to your hand.
8. Resolve the Blazing Rootwalla trigger from step 2, causing you to pay 0 to cast it from exile.
9. Repeat steps 4 through 7 one additional time using Blazing Rootwalla instead.
10. Repeat from step 1.

This loop turns your hand into a relentless sacrifice engine by leveraging the zero-cost madness of Basking Rootwalla and Blazing Rootwalla alongside the discard outlet of Sadistic Hypnotist. Whenever either Rootwalla is discarded, its madness ability lets you cast it for free, which in turn triggers Angelic Sell-Sword to create a Mercenary token. That token's entry prompts Cloudstone Curio to bounce your newly cast Rootwalla right back to your hand, ready to be discarded again. This creates a perpetual cycle of entering and leaving the battlefield that can be repeated as many times as you like, flooding the board with infinite creature tokens while effortlessly shredding your opponents' hands.