Card bans affect MTG Arena just as they do paper Magic - so the above MTG banlists apply to Arena too
For example, suppose you control Edgar, King of Figaro and Ral Zarek and you activate Ral Zarek's last ability ("7: Flip five coins
One of the most famous of these cards, Faithless Looting, reads: Draw two cards, then discard two cards. At 1 Red mana, Faithless Looting remains a staple in quite a lot of decks, and is banned in Modern literally because it fueled so many Graveyard style decks
Like most Magic: The Gathering cards, the value of Court of Ardenvale depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Wilds of Eldraine Commander)