These were Magic's first four-color legendary creatures, which opened up a huge swathe of deckbuilding options that were only previously available to five-color decks
Ichormoon Gauntlet Ichormoon Gauntlet will be a nice addition to planeswalker-heavy decks
Note that this works for when any creature attacks, not just yours, so when someone attacks you and triggers a defensive card you also net the trigger twice, so you could play this in a Pillow Fort deck build around things like Cunning Rhetoric and Search the Premises
Light and color surround Clarabelle as she twirls flawlessly through the room in her Emerald green dress, which I'm sure has nothing at all to do with her being an Emerald card
I fully expect the price on nonfoil uncommon FCAs to drop dramatically over time, rares and mythics will still be hard to pull but there will be a fair amount more of the nonfoils out there, thanks to the Play Boosters
The Turn 1 kill is as simple as Neoforming or Eldritch Evolutioning an Allosaurus Rider and going to town with the combination of Griselbrand and Nourishing Shoal