Scuttling Sliver + Trazyn the Infinite + Prismatic Geoscope + Trickery Charm

Scuttling Sliver

Trazyn the Infinite

Prismatic Geoscope

Trickery Charm

How it works

1. Cast Trickery Charm by paying , causing Trazyn to become a Sliver until end of turn.
2. Activate Trazyn using Prismatic Geoscope's ability by tapping it, adding at least three mana of any color.
3. Activate Trazyn by paying 2, untapping it.
4. Repeat from step 2.

This clever loop turns the graveyard into an engine by letting Trazyn the Infinite inherit the Prismatic Gallery ability, gaining all activated abilities of artifact cards in your graveyard—including a Prismatic Geoscope resting there to generate a surplus of colored mana. Because Scuttling Sliver is also in your graveyard, Trazyn picks up the sliver untap ability as well, though it initially lacks the creature type to use it directly. That is where Trickery Charm steps in, granting Trazyn the Sliver creature type so that it can continually pay the untap cost using the very mana produced by the Geoscope loop, netting infinite colored mana.