are showcase cards legal mtg in Arena! Showcase cards

Chrome Mox Starting the game with extra mana is a huge advantage, and Chrome Mox delivers by turning an exiled nonartifact, nonland card into a permanent mana source

They have no effect in other games

they want more Squirrels

Illustrated with an alternate art style, this Enchanted rarity card captures the essence of Belles unique charm and love for stories

As a further commitment to the bit, Wizards is releasing three LOTR -ified versions of the famous card Sol Ring (yknow, because the whole thing is about rings )

Commanders that draw cards and generate mana at the same time tend to play pretty well, and this is no exception