As you cast your second spell during an opponents turn you may pay {U/R}: if Queen Nova, leading to chaos is a human it becomes a 0/4 Statue with Ward {2} and "you may play sorceries at any time you could cast an instant"

As you cast a spell that shares all colours with Queen Nova, leading to chaos you may remove all cards from your graveyard and pay {B}{B}: if Nova is a statue it becomes a 3/3 God with Indestructable and Prowess "whenever you cast an instant or sorcery draw a card"