Igglybuff does the same while dealing 10 damage
Once you've chosen to draw a card because of the last ability (which is likely as soon as possible, but there may be situations in which you don't want to draw immediately), that ability will stop triggering for the duration of that turn
Some spells will instruct you to exile them if you cast them from other zones, but once a spell resolves from the stack, it typically goes to the graveyard, regardless of where you cast it from
For example, if two creatures you control with lifelink deal combat damage at the same time, Dawn of Hope's ability will trigger twice
Future Frame Memnite The artifact Memnite is a famous free spell that rocks the future frame beautifully in Mystery Booster 2
Still kinda fun though, even if the fact that it only buffs noncombat damage to opponents can be a point of contention