In case anyone didn't see them in the Arena announcements. Coming in the October 10th patch.
From the announcements:
Orcish Bowmasters and The One Ring have been some of the strongest and most played cards in Alchemy and Historic since The Lord of the Rings: Tales of Middle-earth™ was released. After letting the formats adjust to this release, we are rebalancing Orcish Bowmasters and The One Ring.
Orcish Bowmasters had no opportunity cost to be included in every black deck, and as a result, its enter-the-battlefield ability was pushing one-toughness creatures out of Alchemy and Historic. We want to maintain the card's role as a counter to card drawing, so we are removing enter-the-battlefield effect to reduce its warping impact on the metagame.
The One Ring was too efficient at effectively winning the game with its sheer amount of card advantage. We are adding a mana to the activated ability to give players more time to execute their own strategy or interact with The One Ring before it takes over the game.
