Akroan Conscriptor + Leyline Immersion + Mind Games
Akroan Conscriptor
Leyline Immersion
Mind Games
Infinite colored mana that can only be spent to cast spellsInfinite magecraft triggersInfinite mana creatures you control can produceInfinite storm countInfinite untap of creatures you control
How it works
Activate the creature with Leyline Immersion attached by tapping it, adding 3 that can only be spent to cast spells.
Cast Mind Games with buyback by paying 2, targeting Akroan Conscriptor.
Akroan Conscriptor triggers, causing you to untap the creature with Leyline Immersion attached.
Resolve Mind Games, tapping Akroan Conscriptor and returning Mind Games to your hand.
Repeat.
Once you have infinite mana, you may use Akroan Conscriptor's ability to untap any other creature(s) you control.