Kosh, dragon regent

Flying, Menace
{2}{r} all dragons you control get +2/+1
{2}{b} all creatures you don’t control with power greater than five get -2/-0 until end of turn. Only activate this ability if no permanents you control have any pluses to their power or toughness
{8}{b}{b}{r} return Koth, dragon regent from your graveyard to your hand
Sacrifice Koth, dragon regent, prevent all damage that would be dealt to any dragons you control