No. TECLIS CAN CHOOSE WHICH LORE BEFORE THE GAME STARTS.
I'm willing to say that bar bad luck on your opponents behalf, Warriors of Chaos in all of it's guises againsts Teclis (with perhaps the exception of Wulfrik attempting to murder him using Tongues - but that's tailoring, and Wulfrik is fairly shit even for a fighty hero of the calibre WoC can put out, so not advisable for an all comers list).
20 Warriors of Chaos loses a rank bonus with a single wound suffered.
As to how weak trolls are - I've got 2200pts gone into making that unit near untouchable for an all comers competetive meta game. Teclis fucks that up, by being able to choose his Lore before the game rather than in the Army List, and IF'ing anything.
As said, WoC have the weakest match up against Teclis -
Their base Elite units have the best armour save for Cavalry and Infantry available - meaning metal rapes, and also, each turn, your opponent chooses one of your unit, and then proceeds to remove, in your case, 6-7 models.
The Horde units are T3 with no low/no armour against a target with Reroll to hits, fight in multiple ranks (so you're typically up against 4-5 ranks of models fighting you), and capable of being buffed far more efficiently than you can nerf them.
Against Trolls, he can just bring out the Lore of Fire, capable of slapping out a Firestorm, or Burning Head. With MSU, you get less effectiveness from the Warshrines 4+ Ward or the MR2 from Collar of Khorne, while Horde means He can choose Death instead of Purple Sun you're I1-2 Units (although the rest of the lore is near useless).
If you try to counter spell him, he has the Banner of World Dragon, a Scroll of Hoeth which has a chance of stopping you from casting it again, (rendering Third Eye near useless), while he has a 5+ to dispel - it's easier to dispel than it is to cast, as you can choose what's useful and what's not. Not to mention the average 6-7 Dispel Dice average, AND an Annulian Crystal to reduce your average casting dice to 6 and boost his dispel dice to 7-8.
And I think you're discounting a Spear Bunker too easily. With Metal, Teclis can Rust the unit, with Death he can reduce your toughness/strength (with IF as well possibly), and then stack on Fate of Bjuna on your caster. Then factor in that you're testing on a Ld8 against the possibility of Fear causing units potentially reducing your WS1.
So - all that considered - you'd be up against 5 ranks of reroll to hit S3 against WS1 S3 T3 infantry.
Add in the fact that they're cheap as fuck.
No offence, mate, but have you ever played ANYTHING remotely competitive. I'm talking about a copy paste list off the internet used in a GW Store/LGS, but something along the lines of Ardboyz?
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