I often hear that Bleed decks are much better than Vampyre or Life Siphon decks. Could someone please explain why this is?
Usually bleed offers a cheaper upgrade path the life siphon. If a range champ is not engaging in combat that unit might be better off being run with bleed. Bleed allows the range unit to provide a melee unit with localized blood globe. Bleed decks are typically FF UD. Vamp can be FF FW or FF UD, designed to be a split. (Even KF spilts now) Life siphon is an FW-esc ability.