Vhal, Candlekeep Researcher + Umbral Mantle

Vhal, Candlekeep Researcher
Umbral Mantle

Requires
All permanents on the battlefield. Umbral Mantle attached to Vhal. Vhal has at least four toughness. Vhal does not have summoning sickness.
Steps
  1. Activate Vhal by tapping it, adding at least cccc
  2. Activate Vhal by paying 3 and untapping it, giving itself +2/+2 until end of turn
  3. Repeat
Results
Infinite colorless mana that cannot be spent to cast spells from your hand. Infinitely large Vhal until end of turn.