I have a RA build that's mostly anti-melee, but I have two slots for anti-caster spells, so I'm not completely useless against a non-melee team.
I've been using [Ether Phantom] + [Drain Delusions] with mixed success, and was doing better with [Frustration] + [Signet of Humility].
I'm thinking [Frustration] + [Arcane Conundrum] could slow down a Me enough to reliably interrupt, or a Mo or E so much that you really lower their DPS/healing.
Just a random idea ... might be stupid though, I'll concede that.
