Right now, thats Modern and Pauper
Artist Taiga Kasai designed this incredibly dynamic card by depicting Mega Gengar rising above swirling, multicolored clouds
You can grab a Set Booster box for around $124, which is honestly less than I paid when I pre-ordered it a week ago (goes to show you that preordering is a risky bet)
The concept, the presentation, and the mechanic all worked together to create the over all sense I wanted
A 5-mana 5/5 creature that taps for mana is nothing to sneeze at, but not nearly as impressive as doubling spells or damage
Looking at it on a more macro level, I quote an article I wrote a few months ago when Aetherworks Marvel got the boot from Standard: The issue lies in the fact that, even while banning oppressively powerful cards is a good thing for the format theyre being removed from, it carries repercussions on the rest of the format