Basalt Monolith, Toymaker, and Biomancer's Familiar

Prerequisites

• Basalt Monolith on the battlefield
• Toymaker on the battlefield
• Biomancer's Familiar 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 , untapping it
4. Repeat from step 2

Results

• Infinite colorless mana