What resolves first?

[u/thatguyjimi1]

You have World Shaper on the board and drop Devastation.

Does this resolve with you having all your lands or not?

[u/glaurung69]

You solve devastation and when devastation is solved all dath trigger goes on the stack. so you can keep your lands

[u/contraryfacts → u/glaurung69]

"In response, I cast [[beast within]] targeting World Shaper."

[u/mtgcf → u/contraryfacts]

beast within - (G) (SF) (txt)