Cards like Lagrella, the Magpie or Fiend Hunter work perfectly with ETB strategies because they temporarily exile creatures, which lets you retrigger their effects once those creatures return
This could be applied to Misty, giving the player three or four flips rather than infinite
Hooting Mandrills A 4/4 trample for 3 is usually the norm as a Constructed playable, and Hooting Mandrills can be at least a 4/4 for 4
In any given white go-wide deck, it would be pretty reasonable to have, say, five creatures on the board
Ashling, Rekindled / Ashling, Rimebound Big spells and is a welcome combination and Ashling, Rimebound gives you a great jump on those costs
Be sure to check out all of the previews at www.mtgpreviews.com: Lost Caverns of Ixalan Spoilers October 30 | 8/8 God for Two, Staple Removal and Resplendent Angel Lost Caverns of Ixalan Spoilers October 31 | Artifact Support, Shark Land and Reanimation Lost Caverns of Ixalan Spoilers November 1 | Precon Decklists and Cascading ETB Dino Lost Caverns of Ixalan Spoilers November 2 | Remaining Rares, Full Jurassic World and Commander Reprints Lost Caverns of Ixalan Spoilers November 3 | Full Set Revealed