I'm finding it nearly impossible to beat any decent greenskin player with high elves.
I've tried variations of princess on star dragon+4 shadow warriors+high mage (on a chariot) with arcane unforging, apotheosis, and soul quench+2 dragon princes+ellyrian reavers archers or stuff, but the best I can manage is getting them on the ropes and losing a really close match. After losing last night to a player who stayed in the trees I think I might eke out a kitey win on an open map but any large forests make it a non-starter.
I tried mass swordmaster plus Allarielle to arcane unforgettable the waaagh. Even with a delayed waaagh, that didn't work out.
I've tried Phoenix guard resistance stacking with Allarielle but I found that any artillery wrecks the elf box and it's hard to force an engagement with limited mobile forces and the ranged units you can actually protect within the resistance auras is not enough to force engagement either.
So, how do you win as high elves? Or if you've been playing greenskins, what actually beats you rather than giving you a nail biter of a win?