Machine God's Effigy + Nyxbloom Ancient + Horseshoe Crab

Machine God's Effigy
Nyxbloom Ancient
Horseshoe Crab

Requires
All permanents on the battlefield. Machine God's Effigy on the battlefield as a noncreature copy of Horseshoe Crab.
Steps
  1. Activate Machine God's Effigy by tapping it, adding uuu
  2. Activate Machine God's Effigy by paying u, untapping it
  3. Repeat
Results
Infinite blue mana.