Scuttling Sliver + Trazyn the Infinite + Amoeboid Changeling + Sceptre of Eternal Glory

Scuttling Sliver

Trazyn the Infinite

Amoeboid Changeling

Sceptre of Eternal Glory

How it works

1. Activate Amoeboid Changeling by tapping it, causing Trazyn to become a Sliver until end of turn.
2. Activate Trazyn using Sceptre of Eternal Glory's ability by tapping it, adding three mana of any color.
3. Activate Trazyn by paying 2, untapping it.
4. Repeat from step 2.

This ingenious loop turns Trazyn the Infinite into a one-man mana engine by borrowing abilities from the graveyard and the battlefield. Because Scuttling Sliver grants every Sliver you control the ability to untap itself for two mana, Trazyn inherits this exact text through its Prismatic Gallery ability once Amoeboid Changeling temporarily makes it a Sliver. With that untap loop enabled, Trazyn can repeatedly use the tap ability of Sceptre of Eternal Glory to generate three mana of any color, easily paying the untap cost and leaving you with infinite colored mana.