Magus Lucea Kane and Agatha's Soul Cauldron on the battlefield.
Pili-Pala exiled by Agatha's Soul Cauldron.
Magus Lucea Kane has at least one +1/+1 counter on it, and does not have summoning sickness.
Steps
Activate Magus Lucea Kane by tapping it, adding ({C} magic symbol) ({C} magic symbol) and copying the next spell you cast or ability you activate with ({X} magic symbol) in its mana cost.
Activate Magus Lucea Kane using Pili-Pala's ability by paying ({2} magic symbol) and untapping it, adding one mana of any color.
Repeat.
Results
Infinite colored mana.
Infinite colorless mana.
Infinite copies of abilities with ({X} magic symbol) in their cost.
Infinite copies of spells with ({X} magic symbol) in their mana cost.