Shrieking Drake + Chakram Retriever

Shrieking Drake
Chakram Retriever

Shrieking Drake in hand. Chakram Retriever on the battlefield. You control a creature that can tap to produce at least 1u.
  1. Activate any creature by tapping it, adding at least 1u
  2. Cast Shrieking Drake by paying u
  3. Chakram Retriever triggers, untapping the mana-producing creature
  4. Shieking Drake enters the battlefield, returning itself from the battlefield to your hand
  5. Repeat
Infinite mana creatures you control can produce. Infinite ETB. Infinite LTB. Infinite storm count.