Agatha of the Vile Cauldron, Cogwork Assembler, and Mana Vault

Prerequisites

• Agatha of the Vile Cauldron on the battlefield
• Cogwork Assembler on the battlefield
• Mana Vault on the battlefield
• Agatha of the Vile Cauldron has power 4 or greater
• at most available

Steps

1. Activate Cogwork Assembler by paying at most , creating a token copy of Mana Vault
2. Activate the Mana Vault token by tapping it, adding
3. Repeat
4. If Agatha of the Vile Cauldron has power 5 or greater, this combo nets infinite mana and you can then target any other artifact(s) using Cogwork Assembler

Results

• Infinite colorless mana
• Infinite copies of artifacts you control with haste
• Infinite creature tokens with haste
• Infinite ETB