The River Phlegathon

{w}{t} Target creature gains haste until end of turn
{w}{t} Pay 2 life, Deal 4 damage divided among any number of creatures target player controls
{w}{w}{t} Pay 4 life, sacrifice The River Phlegathon, Target player gains an enchantment curse, it has this enchantment's control loses 4 life at the beginning of their upkeep