Duergar Mine-Captain, Nyxbloom Ancient, and Cryptolith Rite

Prerequisites

• Duergar Mine-Captain on the battlefield
• Nyxbloom Ancient on the battlefield
• Cryptolith Rite on the battlefield
• Duergar Mine-Captain does not have summoning sickness
• available

Steps

1. Declare Duergar Mine-Captain as an attacker
2. Activate Duergar Mine-Captain by paying and untapping it, causing all attacking creatures to gain +1/+0 until end of turn
3. Activate Duergar Mine-Captain by tapping it, adding three mana of or
4. Repeat from step 2

Results

• Infinite colored mana that can only be spent during combat phase
• Infinitely large attacking creature