This suits any multiplayer deck with Red, but I also love it strongly in blink, midrange, reanimation, artifacts matter with Goblin Welder style stuff, and loads more
My favorite is Torrential Gearhulk, which is a strong win condition for control decks, allowing you to ambush your opponents creature with a 5/6 flash creature and cast a strong instant from your graveyard like Cryptic Command or Magma Opus
While this new 4-Color Omnath is still slow to get going, lacking any kind of consistent board presence until turn three, it can stall using the Evoke Elementals and the new Warp cards
Although still good in the deck you don't want to be going over board on looting
If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs, such as emerge costs
Then, if your Leader's type includes "Whitebeard Pirates", this Character gains [Rush] during this turn." This character, while high in cost, allows us to weaken characters for an easier swing at opposing leaders and potentially taking out a pesky blocker