Crystalline Crawler, Gideon's Sacrifice, Pestilence Demon, and Vigor

Prerequisites

• Crystalline Crawler on the battlefield
• Gideon's Sacrifice in hand
• Pestilence Demon on the battlefield
• Vigor on the battlefield
• available

Steps

1. Cast Gideon's Sacrifice by paying , causing all damage that would be dealt this turn to you or to permanents you control to be dealt to Crystalline Crawler instead
2. Activate Pestilence Demon by paying , dealing 1 damage to each creature and each player
3. Gideon's Sacrifice redirects damage to Crawler, which results in at least four +1/+1 counters being placed on it instead due to Vigor
4. Activate Crystalline Crawler's first activated ability at least once by removing at least one +1/+1 counter from it, adding at least
5. Repeat from step 2

Results

• Infinite +1/+1 counters on Crystalline Crawler
• Infinite colored mana
• Infinite damage to opponent and each creature your opponents control