Anticausal Vestige + Cloudstone Curio + Progenitor Mimic

Anticausal Vestige

Cloudstone Curio

Progenitor Mimic

How it works

1. Cast Progenitor Mimic by paying its mana cost. Choose to have it enter as a copy of Anticausal Vestige.
2. When Progenitor Mimic enters, Cloudstone Curio triggers, returning Anticausal Vestige from the battlefield to your hand.
3. When Anticausal Vestige leaves the battlefield, it triggers, causing you to draw a card and and put Anticausal Vestige from your hand onto the battlefield.
4. When Anticausal Vestige enters, Cloudstone Curio triggers, returning Progenitor Mimic from the battlefield to your hand.
5. When Progenitor Mimic leaves the battlefield, it triggers, causing you to draw a card and put Progenitor Mimic from your hand onto the battlefield as a copy of Anticausal Vestige.
6. Repeat from step 2.

This ingenious loop turns a self-referential bounce cycle into an endless engine of discovery. By pairing Cloudstone Curio with a copied Anticausal Vestige, every time one enters the battlefield, the static trigger catches the other and bounces it safely back to your hand. Meanwhile, Progenitor Mimic maintains the illusion by constantly re-entering as another copy of Anticausal Vestige, ensuring that every time these permanents leave the battlefield, their leaving-play triggers fire off to draw you a card and drop the bounced piece right back onto the board.