Bahamut

Cannot be countered.
Flying, Indestructible, Trample, Protection from Dragons
{2}: Scry 1 for each Dragon you control.
{3}{u}{u}: Gain control of all Dragons
{w}{r}: All Dragons get +1/+1 until end of turn.
{b}{g}: Regenerate all Dragons.
{2}{b}{b}: Destroy all Non-Dragons.
When Bahamut dies, is exiled, or leaves your battlefield
for any reason, exile it and return it at the start of the
next end step.