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Dollmaker's Shop, Xenagos, the Reveler, and Kindred Summons, and Massive Raid are all super effective with a wide board of creatures

There are a few other Gengar with a similar value, leaving you with a difficult choice if you can only buy one

Two of its modes are two for ones and the steal ability has multiple relevant targets in Modern, so I would recommend playing this card in most decks which are able to pay for its restrictive mana cost

Why these hooded members of the Azorius guild are so flaccid isnt clear, but the implication is

If you're behind, play it as a land

Of course, there are yet more metagame mechanics woven in here