Voltaic Construct + Silverskin Armor + Elvish Aberration

Voltaic Construct

Silverskin Armor

Elvish Aberration

How it works

1. Activate Elvish Aberration by tapping it, adding
2. Activate Voltaic Construct by paying 2, untapping Elvish Aberration.
3. Repeat

To pull off this infinite mana loop, you first need to make your creature an artifact so it can be targeted by your untapper, a role perfectly filled by Silverskin Armor. Once equipped, your Elvish Aberration gains the artifact type, allowing Voltaic Construct to untap it using a portion of the green mana you just generated. By filtering two of that mana back into the Construct's ability, you net one green mana with each iteration, fueling an endless cycle of taps and untaps.