Sometimes it prevents library-out, but that's a rare case
You do need to deal combat damage for their trigger, but with menace that shouldnt be an issue, and as we all know, cheating on mana costs is one of the most broken things you can do in the game
Flipping Heliod fills the role of a planeswalker in 60-card Azorius control decks, and you get a ton of value out of sorcery speed card draw cast as instants, like Prosperity
If it is destroyed but put into a zone other than a graveyard, you'll gain life
What you need to get going is a Relic of Legends, which can let you tap an untapped legendary creature to add one mana of any color, and Acererak the Archlich, a three-mana Zombie Wizard with an enter the battlefield trigger to venture into the dungeon