Thermo-Alchemist, Chandra, Torch of Defiance, Firebrand Archer, and Kessig Firebreather hit all opponents simultaneously, have their output amplified by Solphim, and are bound to trigger often
Swarm is still kicking around sideboards of Oops
Search the actual rules text of cards to find specific abilities: "draw a card" find every cantrip and card draw spell "destroy target creature" removal options "enters the battlefield" ETB triggers for blink decks "whenever a creature dies" aristocrats payoffs "search your library" tutors "each opponent" multiplayer-focused effects for Commander Combine text search with color and type filters to find exactly what your deck needs
Arena was released in 2018 to resounding success, capitalizing on the popularity of such other online card games like Hearthstone, Pokemon, and Yu-Gi-Oh
Some, like Perilous Vault, destroy more than just creatures
League Battle decks tend to be built a bit more competitively while Deluxe Battle Decks are upgraded Battle decks