I'll put Team Tarrasque against nearly any blessable units. Have you looked at a Tarrasque's stats lately? They're significantly obnoxious. Poison cloud, regen, recuperation, high protection + HP, and bile breath. Think Uber-Hydra. Anything that isn't poison-immune will be in for a rough time....
Of course, hordes of undead will probably wear them down, especially if those undead have chill auras. A swarm of ghosts would ruin the Team's day for sure. But that fact just reinforces the previous statement about how there is no "best" unit in Dom 3.
