One of the game types that I remember was four seasons where you put an effect into play for each season
While not strictly drawbacks he does not work well with alternate casting cost cards like Force of Will and Foil or mechanics like suspend which is probably just as well as this guy plus Ancestral Vision would get tedious very fast
#2: Marrow-Gnawer Due to the story in his flavor text, Marrow-Gnawer might be perhaps better known as "The Godfather of Rats." Slaying all your enemies in one night is definitely a Michael Corleone kind of thing
Or maybe theres an onion joke to make
Honorable Mention - Sliver Overlord, Sliver Hivelord, Sliver Queen, Sliver Legion Because they are the one tribal deck that plays so similarly, has the same slate of Slivers each time, and very similar support for them, I find this combo to be very boring, pervasive, and more