(10/1/2009) Nightmare's power and toughness changes as the number of Swamps you control changes
(Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.) Sorcery Color tag templates(None) Bloody Betrayal Gain control of target creature until end of turn
Booster packs are broken out of sealed boxes
At just three mana, you can easily accelerate it out with other cards like Chrome Mox and Lotus Petal, meaning the creature can reliably be cast on turn two (or even on the first turn, depending on your draws)
The versatility of Withering Torment makes sure that you wont get stuck with it in your hand, but if youre just looking for creature removal, there are better options out there
For example, if you control ten permanents, lose control of two, then cast Ocelot Pride, you won't have the city's blessing