"C" cards are usually counterparts of their base forms, but are one rank higher, require one more Monster to Xyz Summon by overlaying monsters of respective levels, and can be alternatively Xyz Summoned through a Rank-Up card
As for its monster effect, its pretty good, allowing you like its Pendulum effect to get a LOST monster from the Graveyard to attack, good stuff
Heartless Summoning Innistrad Remastered Slightly Played - English Out of Stock | $5.39 - + Add to Cart Heartless Summoning, Innistrad Remastered, Enchantment, Rare, Black, Modern, Commander, Mana Cost: 1B Stock @ 10 Ave Store: Not in stock Stock @ 10 Ave Store: Not in stock Search all versions: Heartless Summoning You Might Like:
Alone, Celestine can bring back creatures three mana value or less, which is very on-theme for white reanimation
I left a bit of wiggle room in the inserts so that all the pieces should fit nicely