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It's also a 2/1 on T1 in a Delver deck so it can dish out some damage quickly. Having to spend another 3 mana to make it a 4/4 Mongoose is pretty reasonable. The super TNN mode is relevant in a board...

I completely agree. Hexdrinker is another one I feel surpasses Goyf and Ptera for Thresh!

I think the most obvious target is Marrit Lage, with the usual UR cards like Delver, Pteramander and Lavaman. Otherwise it's a Counterspell when you're ahead and a Divination when you need something.