Forum:Cyber ouroboros, dark spirit art - greed

1. if i remove 1 cyber ouroboros as 1 of the 2 dark monsters to send dark nephthys to the graveyard from my hand, may i activate the effect of that cyber ouroboros at this time or do i miss the timing? assuming there are no other effects activating at this time, i think i should be able to. also, if the 2 darks i removed were 2 cyber ourobros, may i activate the effect of both? im guessing yes since this situation is similar to when multiple jinzo returners are sent to the grave and special summoning more than one jinzo is possible.

2. i have a splendid venus face up on my side of the field and activate dark spirit art - greed by tributing one of my phantom skyblaster tokens (1 dark monster). this card states "your opponent can negate this effect by revealing 1 spell card in their hand". my opponent cannot negate this effect provided my splendid venus is face up when resolving the effect of dark spirit art - greed, correct? i figured they cannot since if you activate a magic drain while controlling a face up splendid venus its effect cannot be negated but i wanted to be certain.