Guile + Vexing Bauble

U identity

Commander legal

The 2 combo pieces

What must be in place

You have a spell in hand you can cast for only colorless mana.

How to execute it

  1. Cast any spell using only colorless mana.
  2. Vexing Bauble triggers, exiling the spell and casting it from exile without paying its mana cost.
  3. Repeat from step 2.

What the combo produces