Critical Mass

Exile all creatures you control.
Instants and sorceries you control cost {r} more
to cast and have Rebound. Each time you cast an instant or sorcery, you may draw a card and play
an additional land that turn. At the beginning
of your next turn's end step, you lose the game.
(If you cast a spell with Rebound from your hand,
exile it as it resolves. At the beginning of your next
upkeep, you may cast that card from exile without
paying its mana cost.)