Bladecoil Serpent

When Bladecoil Serpent enters the battlefield, for each spent to cast it, draw a card.
When Bladecoil Serpent enters the battlefield, for each spent to cast it, each opponent discards a card.
When Bladecoil Serpent enters the battlefield, for each spent to cast it, it gets +1/+0 and gains trample and haste until end of turn.