Part of the decks engine is putting creatures back into hand in order to cast them again, pumping up Animar and getting their triggered abilities another time
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The lowliest Elf can still represent a dangerous threat with their common ability to tap for mana, allowing you to ramp ahead of your opponents and get to your big threats quicker
Aurelia, the Law Above is like that, but you draw the card no matter whose creatures are attacking
Possible packs include Scarlet & Violet sets (Surging Sparks, Prismatic Evolutions, Paldean Fates, 151), Sword & Shield sets, Sun & Moon, and potentially vintage WOTC packs depending on availability