The finnicky nature of the Gallery definitely detracts from the overall experience, since I have no idea if my creations will be saved until after I exit away from them (in which case theyre gone for good if they didnt save)
While there aren't a ton of sacrifice payoffs available at lower rarities, the high rarity has cards like Sephiroth, Fabled SOLDIER and Zodiark, Umbral God as fantastic top-ends
Morinfen Morinfen is similar to Gallowbraid in that its a bad card and you lose life from cumulative upkeep, but it trades the 5/5 trample body for a 5/4 flying body, which is much better
Entropic Uprising Next up, we have the general I have most personal experience with: Yidris, Maelstrom Wielder
What I really like about this card is that you can transform it from the graveyard, because needing 7 mana while its still on the battlefield is far too restrictive