The Master, Formed Anew + Ruthless Technomancer + Zirda, the Dawnwaker + Undercover Operative

The Master, Formed Anew

Ruthless Technomancer

Zirda, the Dawnwaker

Undercover Operative

How it works

1. Cast The Master by paying .
2. When The Master enters the battlefield, it triggers, causing you to sacrifice Undercover Operative and create at least two Treasure tokens.
3. Activate a Treasure by tapping and sacrificing it, adding .
4. Activate The Master by paying and sacrificing a Treasure, returning Undercover Operative from your graveyard to the battlefield as a copy of The Master, which causes the Undercover Operative to be a copy of Ruthless Technomancer.
5. When Undercover Operative enters the battlefield, it triggers, causing you to sacrifice The Master and create two Treasure tokens.
6. Activate a Treasure by tapping and sacrificing it, adding .
7. Activate Undercover Operative by paying and sacrificing a Treasure, returning The Master from your graveyard to the battlefield as a copy of Ruthless Technomancer.
8. Repeat from step 2.

This clever loop relies on trading a cloned legendary identity back and forth between the graveyard and the battlefield. As The Master, Formed Anew enters, it exiles Undercover Operative to set up its takeover ability, while its triggered ability is replaced by the sacrifice effect of Ruthless Technomancer to generate Treasure tokens. You then use those Treasures to pay for Ruthless Technomancer's activated ability—whose cost is conveniently discounted by Zirda, the Dawnwaker—to return the other card from the graveyard. When Undercover Operative re-enters as a copy, it immediately mimics the process in reverse, bouncing The Master back and forth to generate infinite sacrifice and death triggers.