Theorist's Proxy [Reality Fracture]

Flash
When this creature enters, empower Jace 3. (Put three loyalty counters on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")
{U}, Sacrifice this creature: The next spell you cast this turn can't be countered.