Draconian Mastermind

As an additional cost for this spell, discard a dragon or pay 1 {b}.
Reach, Haste.
{b/g},{b/g}:Draconic mastermind gains deathouch until end of turn.
{w/u}: This creature gains flying until end of turn.
When this creature dies, deal 2 to or tap, up to 3 target creatures.