Shadow the Hedgehog, Workhorse, Agatha's Soul Cauldron, Pack Rat, and The Fire Crystal

Prerequisites

• Shadow the Hedgehog on the battlefield
• Workhorse on the battlefield
• Agatha's Soul Cauldron on the battlefield
• Pack Rat in exile
• The Fire Crystal on the battlefield
• available

Steps

1. Activate Workhorse using Pack Rat's ability by paying and discarding a card, creating a token copy of it that will enter with four +1/+1 counters on it
2. Activate the Workhorse token four times by removing four +1/+1 counters from it, adding
3. The Workhorse token dies as a state-based action due to having 0 toughness, triggering Shadow, causing you to draw a card
4. Repeat

Results

• Infinite self-discard triggers
• Near-infinite ETB
• Infinite draw triggers
• Near-infinite LTB
• Infinite rummaging
• Near-infinite death triggers
• Near-infinite colorless mana