Ixalan's Demise

Ixalan's Demise deals X damage to each creature
and each planeswalker. Each players sacrifices X
lands, then discards X cards.
Exile Ixalan's Demise.
Nothing, not the might of the Sun Empire, nor the knowledge of the River Heralds, or even the ferocity of
the Brazen Coalition, could have stopped the
consuming flame.