Basalt Monolith + Heartstone + Karn, Silver Golem

Prerequisites

• Basalt Monolith does not have summoning sickness.

Steps

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

Effects

• Infinite colorless mana