Basalt Monolith + The Blackstaff of Waterdeep + Heartstone
Basalt Monolith
The Blackstaff of Waterdeep
Heartstone
Requires
Basalt Monolith must be on the battlefield.
The Blackstaff of Waterdeep must be on the battlefield.
Heartstone must be on the battlefield.
Basalt Monolith does not have summoning sickness.
Mana needed: 
Steps
- Activate The Blackstaff of Waterdeep by paying and tapping it, causing Basalt Monolith to become an artifact creature.
- Activate Basalt Monolith's first ability by tapping it, adding .
- Activate Basalt Monolith's last ability by paying
, untapping it. - Repeat from step 2.
Results
Infinite colorless mana.
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