Duergar Mine-Captain + Nyxbloom Ancient + Cryptolith Rite

Duergar Mine-Captain
Nyxbloom Ancient
Cryptolith Rite

Requires
Duergar Mine-Captain must be on the battlefield. Nyxbloom Ancient must be on the battlefield. Cryptolith Rite must be on the battlefield. Duergar Mine-Captain does not have summoning sickness. Mana needed: 1rw
Steps
  1. Declare Duergar Mine-Captain as an attacker.
  2. Activate Duergar Mine-Captain by paying 1rw 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.

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