The theory behind curled foils is that humidity changes the fibers of the cardboard, causing it to bend, expand, or contract based on how much moisture is on the card
Maybe in a red/black deck you discard for the hit, and then recover the card you just discarded somehow
And last, but certainly not least, are the Oltec, the living ancestors of the Sun Empire who live in a highly advanced communal society with a direct connection to their gods, as Miguel Lopez, a world-building designer on the expansion, described them in a presentation
With the amount of amazing pingers in Rakdos colors, our Ob Nixilis can easily trigger 10+ times per turn cycle, drowning our opponents in value while we effortlessly 1-shot them with our giant flying trample commander