Malcolm, Keen-Eyed Navigator, Titan of Eternal Fire, Battered Golem, and Mirror Entity

Prerequisites

• Malcolm, Keen-Eyed Navigator 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, dealing 1 damage to an opponent
3. Malcolm triggers, creating a Treasure artifact token
4. When the Treasure enters the battlefield, Battered Golem triggers, untapping itself
5. Activate the Treasure by tapping and sacrificing it, adding
6. Repeat from step 2

Results

• Infinite damage