Quote Originally Posted by Beheld View Post
The spell doesn't target one of all possible Efferti in existence, it goes out and finds a creature that can be called. If you call an Efferti, you don't play a game where you roll XdY to see which one of the infinity it targets, it just calls a valid target, since the planes are literally infinite and there are an infinite number of them, if you cast the spell it gets one of the ones that exists to be called. You might as well claim it calls a stone statute of an Efferti, or a pile of salt, or a corpse.
In a multiverse where Wizards farm Efreeti for wishes it follows that they would protect themselves from that risk. The spell doesn't check if the target has protection.

The infinity argument is spurious because there are an infinite number of Wizards too.