Requires

Gemstone Array must be on the battlefield. Crackdown Construct must be on the battlefield. Power Artifact must be on the battlefield. Mana needed:

Steps

1. Activate Gemstone Array's first ability by paying .
2. Crackdown Construct triggers, getting +1/+1 until end of turn.
3. Resolve Gemstone Array's ability, putting a charge counter on it.
4. Activate Gemstone Array's second ability by removing a charge counter from it, adding .
5. Repeat.

Results