Forum:Effect veiler ?

i summon my "arcana force XII - the world", and my opponent chains "effect veiler" to its heads/tails coin flip trigger effect. because the activation wasnt negated only its effect(and only until the end phase), may i still send 2 monsters i control during that same end phase to the graveyard to activate its heads flip effect.(skipping my opponents turn) since "effect veiler" is no longer negating my "arcana force XII - the world" at that time? (the end phase)

thank you,

Á Nazias Kram Ā