Urza, Lord High Artificer + Pili-Pala + Biomancer's Familiar

Urza, Lord High Artificer

Pili-Pala

Biomancer's Familiar

How it works

1. Activate Urza's first ability by tapping Pili-Pala, adding .
2. Activate Pili-Pala by paying 1 and untapping it, adding one mana of any color.
3. Repeat.
4. Once you have infinite mana, you may use it to activate Urza's ability.

This charmingly eccentric engine uses Urza, Lord High Artificer to turn your creatures into mana sources by tapping them for blue mana. Pili-Pala provides the crucial untap loop, generating mana of any color by tapping and untapping itself, while Biomancer's Familiar steps in to slash the activation cost of Pili-Pala's untap ability down to just one generic mana. Together, Urza and Pili-Pala form a self-sustaining loop that generates infinite colored mana, which you can then channel right back into Urza's five-mana exile-and-play ability to cast your entire library for free.