When Sauron is in play and you're running a bunch of LTR cards, it's trivially easy to get value out of his abilities, whether it's getting an extra ring temptation in, getting the ball rolling with your Army, or absolutely churning through your deck in concert with a card like In the Darkness Bind Them
It's not quite on the level of Teferi's Protection, but saving yourself from an opponent swinging out can turn the game in your favour no matter what
This means your cards will stay firmly inside the sleeves, reducing the likelihood of delamination where the outer layers of the sleeves start to peel apart after heavy use
The first two expansions of the game contained three lands that were well worth using twice in a turn
New Arena players are offered several pre-made decks to start with (like the Welcome Decks and Intro Decks offered in brick and mortar stores) or they can spend real money to purchase booster packs or enter events, gathering single cards to brew their own decks from scratch