From humble beginnings playing Ayli, Eternal Pilgrim with some janky-ass combos, to Teysa Karlov, Regna & Krav partners, Nalia deArnise and other precons, both Liesa, Shroud of Dusk and Liesa, Forgotten Archangel (two very different decks), Ive tried many different styles
When Treasure Keeper dies, reveal cards from the top of your library until you reveal a nonland card with converted mana cost 3 or less
Initially you could find them as a group for $150-200 but collectors and players quickly started moving on to other products that were being released at the end of 2020
I ended up with a 3/6 creature, my opponent lost three life, I destroyed a creature, and I basically cycled my hand
Additional rulings can be found in Gatherer
The more you mill or sacrifice, the more mana that The Core is worth when you tap it