[@Slime] I think Phantasmagoria is a little too strong. Remember, Mages are powerful, but not exactly powerful enough to take on a Servant. Their spells can be powerful, but if the Caster has a hard time with the Knight Classes, mage would have a even harder time. And the Caster excels at Magic more than a mage ever could.

Circuits are how many. For instance, Shiro Emiya has one or two, while I think Rin Tohsaka has closer to Seventy... and you see the type of Magic she is capable of.