Planar Engineering Landfall is very strong at the moment
We already have a couple of enchantment decks built around cards like Hallowed Haunting that could easily run Invasion of Theros to tutor Heliod, the Radiant Dawn and Ossification and then flip into Ephara, which seems like a tough card to beat outside of a Farewell or Sunfall
Since the steps of the turn are not raced, they are jumped straight to the cleanup step, right after the End Step, a trigger that happens at the end of the combat, as in the case of Delina, Wild Mage that creates tokens that exile in that part of the turn, no longer occurs
And this makes many of them trivial from a complexity point of view
This strikes me as an imminently playable casual commander that'll form its own mini-archetype, similar to Eriette of the Charmed Apple
2000 Filler Card existence to be verified