Forum:Chaos emperor dragon debate

hello. i was just wondering if the good people of this website could help me solve a little dilema between me and my older brother. we were dueling and i was ahead. removed from play on my side of the field are three cards: "white magical hat" "the calculator" and "ceasefire." within my hand i had my chaos emporer dragon-envoy of the end and a mystical space typhoon. in my graveyard i had plenty of dark monsters, such as doom shaman, summoned skull, and giant orc, just to name three. i had 8000 lp left. he had 2200. he had 6 cards in his hand and on the field he had 8. my side of the field i had 3 monsters and 3 traps. can i play my chaos emperor dragon if i remove from play my summoned skull or not? if you don't mind, please e-mail me your answer at carternoble95@yahoo.com. i would greatly appricate knowing that i had won because he gets very cocky every time we play and i would enjoy hanging something over his head. again, thank you.