They are Opt , Demonic Tutor , and Swords to Plowshares
Marauding Blight-Priest , Epicure of Blood , and Defiant Bloodlord are all under 40 cents and each copy the Sanguine Bond drain effect
Put her as the leader of a casting-cost matters build that uses effects like Explosive Revelation to smash people with higher casting costs or effects like Rush of Knowledge with an expensive card such as Draco
Counters, tokens, and scaling creatures can turn a few points of life into real pressure if the deck is built around it
Because he can easily turn valuable resources into dumb animals
If your opponents do manage to keep creatures up, Gruul War Chant gives all your creatures menace, which forces them to block inefficiently, while Berserkers' Onslaught grants double strike, which turns even a small army of 4/4s into devastating attackers