Basalt Monolith, Toymaker, and Agatha of the Vile Cauldron

Prerequisites

• Basalt Monolith on the battlefield
• Toymaker on the battlefield
• Agatha of the Vile Cauldron on the battlefield
• Toymaker does not have summoning sickness
• You have at least one card in hand
• Basalt Monolith does not have summoning sickness
• available

Steps

1. Activate Toymaker by paying , tapping it and discarding a card, causing Basalt Monolith to become an artifact creature until end of turn
2. Activate Basalt Monolith's first ability by tapping it, adding
3. Activate Basalt Monolith's last ability by paying at most , untapping it
4. Repeat

Results

• Infinite colorless mana