I have one Dawn of Hope and two Soul Warden on the field. Another creature enters the battlefield, triggering both Soul Wardens' effects. Since each Soul Warden causes a separate life-gaining event, I know that I can activate the effect of Dawn of Hope twice, to draw two cards.
But can I activate it once, look at the card I draw, and only then decide whether or not to activate it a second time? Or must I decide it all at once?