Im going to assume you were having problems in the pantheon eh [shakeNbake]?
Well it sucks going against a good minion erebus, especially if you are focused on towers early game and you dont have your hammer slam aoe, which lets be honest isnt a great aoe attack as it has to be wound up and if you get stunned doing that well you're screwed right there, though i'm going to hope you boulder rolled eb first ^^.
What makes things worse is your teammate is most likely a rook or regulus... and if he is new might not be going mine in which case he is absolutely worthless. Sorry just my own experience trying rook in pantheon.
I dont want to see him nerfed though, he was already nerfed and to be honest i find a spirit assassin oak to be bit better with the added damage % taken after penitence, although bite does reduce armor... maybe i take that back and just say oak would need as much rebalancing.
I do think a minion oak is the natural counter to a minion eb though. Eb doesnt have any aoe besides stun and mist and he probably isnt going mist with minion build where as oak has a good aoe attack that also adds benifits for his soldiers.
Rock, Paper, Scissors... unfortunately UB and EB are most played on darkside and Rook, Reg are most played on lightside in pantheon and that matchup is a nightmare, for me atleast. But maybe im just not pro