You choose targets for that ability as it goes on the stack
We're returning to the idyllic plane of Lorwyn-Shadowmoor, where pastoral creatures transform with the changing of the landscape
95% of the time, the triggered ability probably isnt worth a removal spell thats going to be better sent towards Rhystic Study or Smothering Tithe, but once enough cards have been exiled, the risk from rolling a 20 is going to weigh on your opponents
The modal double faced cards (with lands on the back) will help the value as the cards in Zendikar Rising are several dollars now, and the same is likely in a bit for some of the uncommons from Modern Horizons 3
Creatures (37) 4 Meddling Mage 4 Noble Hierarch 3 Phantasmal Image 4 Champion of the Parish 4 Thalia, Guardian of Thraben 4 Mantis Rider 4 Reflector Mage 4 Thalia's Lieutenant 3 Kitesail Freebooter 3 Unsettled Mariner Lands (19) Spells (4) For the maindeck, I want to focus on seeing just how useful Unsettled Mariner can prove itself to be, as I think it has the highest potential upside