1.0.9 Sneak Peek- Frozen

That only means you came too late to the party. Apparently before his nerf TSO was indeed a game breaker:

Since then there was another reason added why TSO is even less of a problem. With the boost to stats, skull damage is now much more important than spell damage, and silence can’t protect you from that. I have won multiple PVP matches without even firing a spell once.

For the exact same reason you would think entangle should be OP. The reason it isn’t is because it’s only effective on the first troop, which means it only works 25% of the time for both random entangle and AI targeted entangle. Now, if you could entangle any random enemy and still get the same effect, don’t you think there would be an outcry?