If it's a permanent card, they put it onto the battlefield
Starting Wednesday at the Arena Streamer Pre-Pre-Release event, I'm sure that people will be playing all ten of these as Companions to determine which ones are going to be worth building around
Now, I know there's a counterargument to all of this: Magic Arena has a free-to-play option, which is missing from both Magic Online and paper Magic
With Abyss Proxy Shop, you can play with The One Ring and every legendary Commander staple you need all without spending a fortune
Your cards are cheap and you can operate fine missing a land for a couple of turns, so aiming a bit low isnt terrible, but you do actually want to do things at some point
Gets even spicier with the top end that green decks get to indulge in