Another new card from Hearthstone's Curse of Naxxramas set was revealed this afternoon: Loatheb. Loatheb is a legendary with one heck of a Battlecry. On the turn after Loatheb has been played, enemy spells cost 5 more mana. Any spell-heavy deck will be crippled for at least one turn, including the ever-infuriating Miracle Rogue.
Loatheb's 5/5 stat spread falls right into the standard range for a 5 mana minion. However, combined with its Battlecry, many players are already shouting overpowered. They may not be entirely wrong; 5 mana for a minion that can briefly cripple an entire deck and is quite beefy through raw stats alone is a huge threat. Loatheb may go down the same road Sylvanas did. Sylvanas was also once a 5/5 for 5 mana, but her cost was later changed to 6 mana to better reflect the actual threat she posed.