My Aurelia, the Warleader deck has enjoyed many upgrades in the past year or two, and they have predominantly been in the card draw department
All three formats ship free
Gale Thrust may begin at 60, but if Mega Lopunny moved from the Bench to the Active Spot that turn, it jumps to 230 damage, which is an excellent rate for a single Colourless attachment
(It can't be the target of spells or abilities.) Creature - Mutant Frog Silverback Elder Whenever you cast a creature spell, choose one Destroy target artifact or enchantment
So yeah, those were the three different types of unofficial cards that you might encounter, each with varying degrees of legality
You can use this to imprint two copies of Slime Against Humanity, netting twice as many Oozes per cast, or you can imprint another sorcery for value