Agatha of the Vile Cauldron has power 2 or greater.
You have at least two opponents.
({1} magic symbol) ({U} magic symbol) available.
Steps
Activate Faerie Mastermind by paying ({1} magic symbol) ({U} magic symbol) , causing you to draw a card and create a Treasure artifact token for each opponent you have.
Activate two Treasures by tapping and sacrificing them, adding ({1} magic symbol) ({U} magic symbol) .
Repeat.
If you have three or more opponents and/or Agatha of the Vile Cauldron has power 3 or greater, this combo nets near-infinite Treasure tokens and colored mana.