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We might see the deck even splash another color, but white-based decks are now a possibility with the inclusion of Knight of the White Orchid and Archangel of Tithes
In other words, that's four mana of value you can gain the same turn she enters the battlefield
My general ratio is: lands and ramp, usually a 3713 split 50 mana
If you decide to pay 1 life and Corpses of the Lost is still on the battlefield, it will immediately return to its owner's hand
In my experience it is often inevitable that a Heliod deck will be able to put one of their combos together, and it might be better to hold instant removal back to break up whatever version they end up finding, lest you waste it early on a redundant or superfluous creature