Ulvenwald Mysteries, Angelic Sleuth, Ashnod's Altar, and Cathars' Crusade

Prerequisites

• Ulvenwald Mysteries on the battlefield
• Angelic Sleuth on the battlefield
• Ashnod's Altar on the battlefield
• Cathars' Crusade on the battlefield
• You control a Clue
• available

Steps

1. Activate a Clue by paying and sacrificing it
2. Ulvenwald Mysteries' second ability triggers, creating a 1/1 Human Soldier creature token
3. The Human Soldier enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control
4. Resolve the Clue ability from step 1, causing you to draw a card
5. Activate Ashnod's Altar by sacrificing the Human Soldier, adding
6. The Human Soldier leaves the battlefield, triggering Angelic Sleuth, creating a Clue token
7. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite +1/+1 counters
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite sacrifice triggers