Requires

Basalt Monolith must be on the battlefield. Tough Cookie must be on the battlefield. Heartstone must be on the battlefield. Basalt Monolith does not have summoning sickness. Mana needed:

Steps

1. Activate Basalt Monolith's first ability by tapping it, adding .
2. Activate Tough Cookie's first activated ability by paying , making Basalt Monolith a 4/4 artifact creature until end of turn.
3. Activate Basalt Monolith's last ability by paying , untapping it.
4. Activate Basalt Monolith's first ability by tapping it, adding .
5. Repeat from step 3.

Results