For example, you can't cast a creature card with mayhem you couldn't normally cast during an opponent's turn, even if you discard that card during an opponent's turn.
As, in responding to a question, MTGs Lead Designer, Mark Rosewater, seemed to reveal other supertypes are in the works
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You exile two such permanents you control and two nonland cards from your graveyard with activated abilities
PERFECT DIMENSIONS FOR TOP LOADERS Expertly sized for maximum fit and display: Exterior dimensions: 29 25 cm | Inner pocket size: 11 8.4 cm
It's common to be able to attack with up to 10-12 evasive damage on turn 4 and if, somehow, your opponent is alive by turn 5, this deck can easily attack for 20-25 damage on turn 5 alone, with flying