Irbryn

+1: Attach Irbryn to target dragon you control, it gains +2/+2 for as long as Irbryn remains attached. Irbryn can't be attacked when attached
-4: Summon a legendary 4/4 "Dave" drake dragon with a colour of your choice and "tap deal 2 damage to target creature"
-7: Choose target creature, it becomes a dragon until end of turn. all dragons you control get +2/+2, trample and haste until end of turn