For one, only the mainline 16 games are represented in the set
It takes too much mana to reanimate, so its only enticing if you can leverage the +1/+1 counters on gaining life
Mysterious Stranger is a flash speed one-off Wildfire Devils of sorts
When the ability tries to resolve, if the number of attacking creatures is no longer greater than the number of quest counters on ED-E, it won't resolve, and you won't put a quest counter on ED-E
Sometimes it would draw the engine, sometimes it would draw the extra turns, sometimes it would draw the win conditions, but it had a very hard time consistently doing them together
The long games are interesting, the mana is good, and Ive been enjoying it greatly.