Extos, Rainbow Gem

Trample, Menace
Saddle {10}- When Extos, Rainbow Gem is Saddled, it
gains the +X/+Y until end of turn. Where X is equal to
the total power of all tapped creatures you control and
Where Y is equal to the total Toughness of tapped creatures you control.
{6}{w}{u}{b}{r}{g}— Sacrifice Extos, Rainbow
Gem. If you do then all opponents take damage equal to
the total power of their creatures.