The card's only been printed in three supplementary sets: Modern Horizons , Double Masters 2022 , and as a Timeshifted reprint in Modern Horizons 2
Thats an outrageous bit of value attached to one of your characters and it also protects you against the classic one-two punch of the meta defining ruby-amethyst control deck of set two, which would wipe your board with Be Prepared and then answer the first character you play with a Lady Tremaine which would force you to sacrifice it
As well, once Ovinomancer was active, it was nigh-unkillable itself, since returning it to your hand is part of the cost and not effect
Meanwhile, Hildibrand MandervilleHildibrand Manderville, and the token he makes, are great sacrifice fodder
If it dropped a token when it entered the battlefield, it would be good
If you have any ways to blink Filigree Racer, you can start racking up lots of energy counters in short order