Wasteland

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

Take an extra turn after this one.

Destroy all lands.

T: Add C. 1, T: Tap target land.

Destroy all creatures. They can't be regenerated.

Flash When this creature enters, copy target instant or sorcery spell. You may choose new targets for the copy.

2R, T: Create a token that's a copy of target creature card in your graveyard, except it's an artifact in addition to its other types. It gains haste. Sacrifice it at the beginning of the next end step.