After all permanents are put onto the battlefield and you planeswalk away from Morphic Tide, any abilities that triggered from those permanents entering, from the previous generation of permanents leaving the battlefield, and from the new plane or phenomenon will be put onto the stack. You'll put all of your triggered abilities on the stack in any order, then each other player in turn order will do the same. (The last ability put on the stack will be the first one that resolves.)