Voltaic Construct + Sanctum Weaver + Transmogrifying Licid

Voltaic Construct

Sanctum Weaver

Transmogrifying Licid

How it works

1. Activate Sanctum Weaver by tapping it, adding at least 3.
2. Activate Voltaic Construct by paying 2, untapping Sanctum Weaver.
3. Repeat

This loop turns Sanctum Weaver into an absolute powerhouse of mana production by fundamentally rewriting what it means to be an artifact creature. Through its activation, Transmogrifying Licid attaches itself to Sanctum Weaver, seamlessly transforming our mana dork into an artifact enchantment that still retains its creature type. This makes Sanctum Weaver a legal target for Voltaic Construct, whose ability uses the mana generated by Sanctum Weaver to untap it repeatedly. As long as you control enough enchantments to cover the untap cost, this creates an endless cycle of tapping for massive colored mana and paying to untap your newly minted artifact creature.