Tromell, Seymour's Butler, Pentad Prism, and Seedcradle Witch

Prerequisites

• Tromell, Seymour's Butler on the battlefield
• Pentad Prism on the battlefield
• Seedcradle Witch on the battlefield
• available

Steps

1. Activate Tromell by paying and tapping it, causing you to put at least five charge counters on Pentad Prism
2. Activate Pentad Prism five times by removing five charge counters from it, adding
3. Activate Seedcradle Witch by paying , untapping Tromell and giving it +3/+3 until end of turn
4. Repeat

Results

• Infinite colored mana
• Infinite proliferate
• Infinite charge counters on Pentad Prism
• Infinitely large creature until end of turn
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce