Marneus Calgar + Ashnod's Altar + Training Grounds

Marneus Calgar
Ashnod's Altar
Training Grounds

Requires
All permanents on the battlefield. 4 available.
Steps
  1. Activate Marneus by paying 4, creating two 2/2 Astartes Warrior creature tokens
  2. The tokens enter the battlefield, triggering Marneus, causing you to draw a card
  3. Activate Ashnod's Altar twice by sacrificing both Astartes Warriors, adding cccc
  4. Repeat
Results
Infinite card draw. Infinite draw triggers. Near-infinite ETB. Near-infinite LTB. Near-infinite death triggers. Near-infinite sacrifice triggers.