Final Showdown There are instant-speed board wipes, especially for smaller creatures, but Final Showdown drops as the best of a very limited field
While this ability is already potent, Jin -Gitaxias forces one's opponents to potentially waste their resources, automatically countering the first instant, sorcery, or artifact an opponent would cast each turn
What complicates things (and as already mentioned, makes many Commander players dislike this effect) is that your opponents are drawing a fresh grip of cards
One kind of creature thats really good to have in play in large numbers is Slivers
Unctus, Grand Metatect is certainly a glow up from Grand Architect
However, while that deck's commander, Prosper, made a treasure every time the player casts a spell from exile, Faldorn makes a 2/2 wolf token