Voltaic Construct + Silverskin Armor + Incubation Druid

Voltaic Construct

Silverskin Armor

Incubation Druid

How it works

1. Activate Incubation Druid by tapping it, adding three mana of any type a land you control can produce
2. Activate Voltaic Construct by paying 2, untapping Incubation Druid.
3. Repeat

This clever loop turns Incubation Druid into a one-man mana engine by transforming it into an artifact creature with Silverskin Armor, allowing Voltaic Construct's ability to untap it repeatedly. Because Incubation Druid has been adapted—or otherwise gifted a +1/+1 counter—its tap ability produces three mana, which easily pays the two-mana cost required by Voltaic Construct while leaving a net profit of mana each cycle.