Dark Rebellion Xyz Dragon

Haste, trample, Xyz (choose two creatures with a converted mana cost of four, put one on top of
the other then it this card on both (the cards
underneath can not attack or block and are now considered Xyz materials)
Send two Xyz material to the graveyard to choose
one card your opponent controls, It loses power
and toughness divided in half rounded up this
Dark Rebellion Xyz Dragon gains the lost power
and toughness.