Agatha of the Vile Cauldron, Mirror Entity, Ygra, Eater of All, and Sam, Loyal Attendant

Prerequisites

• Agatha of the Vile Cauldron on the battlefield
• Mirror Entity on the battlefield
• Ygra, Eater of All on the battlefield
• Sam, Loyal Attendant on the battlefield

Steps

1. Activate Mirror Entity, choosing for X to equal Agatha's power plus 1
2. You'll play a total of due to Agatha and Sam
3. Resolve the ability, causing creatures you control to have base power and toughness X/X until end of turn
4. Repeat

Results

• Infinitely large creatures you control until end of turn