Magda, Brazen Outlaw, Titan of Eternal Fire, Battered Golem, and Mirror Entity

Prerequisites

• Magda, Brazen Outlaw on the battlefield
• Titan of Eternal Fire on the battlefield
• Battered Golem on the battlefield
• Mirror Entity on the battlefield
• Battered Golem does not have summoning sickness
• available

Steps

1. Activate Mirror Entity by paying , causing all creatures you control to have base power and toughness 1/1 and gain all creatures types until end of turn
2. Activate Battered Golem by paying and tapping it
3. Magda triggers, creating a Treasure artifact token
4. When the Treasure enters the battlefield, Battered Golem triggers, untapping itself
5. Resolve the Battered Golem ability from step 1, dealing 1 damage to any target
6. Activate the Treasure by tapping and sacrificing it, adding
7. Repeat from step 2

Results

• Infinite damage