That creature deals damage equal to its power to up to one target creature you don't control
Which, given that you need 20 Lore to win a game of Disney Lorcana, can be incredibly powerful when combined with draw abilities on other cards
Your old deck could be more valuable than you realise - or it could be full of Mudholes and goblins worth less than the box they're kept in
But we only had a few hundred slots for cards, and my "things most important to reference spreadsheet" had over 600 rows, and that was me attempting restraint
Sacrifice after III.) I Origin of the Hidden Ones deals 4 damage to any target
My guess is that the combination of all these factors graveyard hate being good, relevant typing, and synergy with both milling and removal effects already key to the deck makes this card more likely to be good than not, and possibly outstandingly so