Scuttling Sliver + Trazyn the Infinite + Trickery Charm + Arc Reactor

Scuttling Sliver

Trazyn the Infinite

Trickery Charm

Arc Reactor

How it works

1. Cast Trickery Charm by paying , causing Trazyn to become a Sliver until end of turn
2. Activate Trazyn using Arc Reactor's ability by tapping it, adding CCC
3. Activate Trazyn by paying 2, untapping it.
4. Repeat from step 2

This clever loop turns the graveyard into an engine by using Trazyn the Infinite's Prismatic Gallery ability to inherit the activated abilities of artifact cards resting there. Because Arc Reactor enters tapped and produces three colorless mana, it can be tapped for mana and then immediately untargeted and readied via the "{2}: Untap this creature" ability granted by Scuttling Sliver. Since Trazyn temporarily becomes a Sliver through Trickery Charm's type-changing mode, it gains that very untap capability itself. By tapping Arc Reactor for three mana, spending two of it to untap Trazyn via the Sliver ability, and netting one colorless mana each cycle, the combination generates an infinite supply of colorless mana.