Machine God's Effigy + Mana Reflection + Horseshoe Crab

Machine God's Effigy
Mana Reflection
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 uu
  2. Activate Machine God's Effigy by paying u, untapping it
  3. Repeat
Results
Infinite blue mana.