Infinite colored mana that can only be spent to cast spellsInfinitely powerful creatures you control until end of turnInfinite 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 4 that can only be spent to cast spells.
Cast Seething Anger with buyback by paying 3, targeting Chakram Retriever.
Chakram Retriever triggers, causing you to untap the creature with Leyline Immersion attached.
Resolve Seething Anger, giving Chakram Retriever +3/+0 until end of turn and returning Seething Anger to your hand.
Repeat.
Once you have infinite mana, you may target another creature with Seething Anger to get infinitely powerful creatures until end of turn, or you may use Chakram Retriever's ability to untap any other creature(s) you control.