If it is destroyed but put into a zone other than a graveyard, you'll gain life
I also think adding replacement and redundancy commanders such as Sythis, Harvests Hand and Calix, Guided by Fate feel like a boring cop-out, especially if you already have other enchantment-matter decks
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
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
A similar phenomenon can be seen with lottery tickets
Sometimes it prevents library-out, but that's a rare case