Dualcaster Mage + Ephemerate

Dualcaster Mage
Ephemerate

Requires
All cards in hand. You control at least one creature. 1rrw available.
Steps
  1. Cast Ephemerate by paying w, targeting any creature you control
  2. Holding priority, cast Dualcaster Mage by paying 1rr
  3. Dualcaster Mage enters the battlefield, creating a copy of Ephemerate targeting Dualcaster Mage
  4. Resolve the copy of Ephemerate, blinking Dualcaster Mage
  5. Repeat from step 3
Results
Infinite ETB. Infinite LTB. Infinite magecraft triggers.