Magus Lucea Kane by tapping it, adding ({2} magic symbol) and causing you to copy the next ability you activate or spell you cast that has ({X} magic symbol) in its cost.
Activate
Gemstone Array's first ability by paying ({2} magic symbol) , putting a charge counter on it.
Activate
Gemstone Array's second ability by removing a charge counter from it, adding ({U} magic symbol) .
Activate
Pemmin's Aura by paying ({U} magic symbol) , untapping
Magus Lucea Kane.
Repeat.
Once you have a large number of delayed triggers, cast a spell or activate an ability with ({X} magic symbol) in its cost to have
Magus Lucea Kane copy that spell or ability infinitely.
Results
Infinite copies of abilities with ({X} magic symbol) in their cost.
Infinite copies of spells with ({X} magic symbol) in their mana cost.