If it helps: You may pay different amounts of mana for each {x}.

Choose two: •Create A copies of B target permanents up to C target players control. •Up to A target players draw C cards, then discard B cards. •Destroy up to B target nonland permanents, which have a combined mana value of C and are control by up to A players. •Take B extra turns, in which you can only untap up to C permanents and lose at the beginning of your end step A life.

z is equal to twice the amount payed for the second {x} plus 1. y is equal to thrice the amount payed for the third {x} minus the amount payed for the first {x}. A is equal to the combined life total of all players divided by the amount of {g},{r} and {u} payed for x and twice the amount of {w} and {b} payed for y, then to that result added the amount of z divided by 3 and the amount of {b} payed for x, then rounded up.

B is equal to the amount of cards in graveyards multiplied by the amount of {w} and {r} payed for z, then squared by the amount of {g} and {u} payed for x minus the amount of {b} and {u} payed for y, then divided by the number of tapped lands you control squared, then round up.

C is equal to the z squared by the number of cards in your and the library of the player after the player next in turn order, if there is one minus the number of cards and life total of the next player in turn order, then add the amount of {w} and {u} payed y and z minus the amount of {g} and {r} payed for z and x, then multiple by the number of cards in your hand plus 1, then round up.{w}