Scuttling Sliver + Trazyn the Infinite + Runed Stalactite + Basalt Monolith

Scuttling Sliver

Trazyn the Infinite

Runed Stalactite

Basalt Monolith

How it works

1. Activate Trazyn using Basalt Monolith's ability by tapping it, adding CCC
2. Activate Trazyn by paying 2, untapping it.
3. Repeat.

This ingenious loop turns Trazyn the Infinite into a one-man mana engine by raiding your own graveyard for the right pieces. Through the shared creature types granted by Runed Stalactite and Scuttling Sliver, Trazyn picks up the crucial untap ability while conveniently inheriting Basalt Monolith's traits from the graveyard. This allows you to tap the artifact directly via Trazyn for three colorless mana, then spend two of that mana to untap him using the Sliver's activated ability, leaving you with infinite colorless mana.