Yeah, I'm not sure MG/Possession really deserves a page. Usually you plan your buys with MG to get the most tokens, perhaps getting a few cheap cards instead of one expensive one. The Possessor can pretty easily get around this by just buying one expensive card, only giving up a single coin token to the Possessed player. The fact that MG is very weak without the coin (just +$1, +1 buy) also mean the Possessor isn't missing out on much by just not playing it. Terminal silver (like Monument) can be a bit more necessary to play than just an extra copper. If it's a solid multi-MG engine, once more, the Possessed player probably already has a stockpile of coin tokens that they earned before getting Possessed, so the Possessor can have a decent turn without doing much. Seems like it'd be pretty late to start picking up Possession as a counter to that MG engine, too.