Carmen, Cruel Skymarcher Carmen, Cruel Skymarcher exploits players sacrificing creatures by becoming a massive threat that generates lots of grindy value over the course of a game
Formats like Standard and Pioneer may be about to have a token/convoke problem
Even ignoring that you dont need access to green mana to play Top, its just an awesome enabler for some of the most powerful cards in Cube that rely on a high volume of artifacts: Beyond that, Top can immediately cash in for the card back at the cost of no life
While that may be a slight bummer, I can assure you that there are still plenty of shenanigans to be had with this little Otter
Each pack has a rather high price tag, but you just cant go wrong with it
They will not overwrite effects that modify power or toughness without setting it (whether from a static ability, counters, or a resolved spell or ability), nor will they overwrite effects that set power and toughness which come into existence after they resolve