Bladecoil Serpent [The Brothers' War]

When Bladecoil Serpent enters the battlefield, for each UU sepent to cast it, draw a card.

When Bladecoil Serpent enters the battlefield, for each BB sepent to cast it, each opponent discards a card.

When Bladecoil Serpent enters the battlefield, for each RR sepent to cast it, it gets +1/+0 and gains trample and haste until end of turn.