Forum:Cloak and Dagger Vs Obelisk the Tormentor

Person A and person B is dueling. person B has Cloak and Dagger activated and he/she calls out Obelisk the Tormentor. Person B end their turn. Person A has 3 monster on the field and person a tribute the 3 monster to summon it. Would it work on Obelisk or it wouldn't?