We could make a green-white-blue-black (GWUB) exalted deck
Its like an extremely powerful Planeswalker ability, except it happens every turn from now on, and cant be attacked or destroyed by most conventional means
The unique bit of Shroud of Shadows to move enemies around is arguably the -most- unique in the trio, enemy moving is rather rare and you can use it to dump non-hunters into places where they'll never bother you again, if it's a hunter then given the bursts of movement happening in the final stretch of a scenario means that you might be able to leave a nasty hunter in the dust behind you, especially if you trigger a free move as well
Whenever another Scarecrow you control enters, destroy target permanent
Being able to pick from multiple variants of the deck is always an advantage
They can slip through the smallest of cracks, so it is impossible to keep these adorable visitors out for long