Agatha's Soul Cauldron, Wildwood Mentor, Krark-Clan Ironworks, and Pentavus

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Wildwood Mentor on the battlefield
• Krark-Clan Ironworks on the battlefield
• Pentavus in exile
• Wildwood Mentor has at least one +1/+1 counter on it
• available

Steps

1. Activate Wildwood Mentor using Pentavus's first ability by paying and removing a +1/+1 counter from it, creating a 1/1 Pentavite artifact creature token
2. When the Pentavite enters the battlefield, Wildwood Mentor's first ability triggers, putting a +1/+1 counter on itself
3. Activate Krark-Clan Ironworks by sacrificing the Pentavite, adding
4. Repeat
5. Once you have infinite mana, you may forego sacrificing the Pentavites
6. Once you have infinite creature tokens, you may activate Wildwood Mentor using Pentavus's last ability any number of times

Results

• Infinite +1/+1 counters on Wildwood Mentor
• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers