Like most Pokmon cards, the value of Latias depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Delta Species)
Fill your deck up with discard effects like Demand Answers, a few super-cheap artifacts like Tormod's Crypt, and then a ton of huge, game-winning effects: Portal to Phyrexia, Threefold Thunderhulk, Platinum Angel, Wurmcoil Engine, the works
I can teach you all about how to fight
See also: Binder layout planner, Binder organization guide Is there a Scarlet & Violet 151 master set checklist? Yes Cardrake provides a visual master set checklist for Scarlet & Violet 151 with all 207 cards
Scrooge McDuck, Richest Duck in the World is a three willpower and five health that quests for one lore and can challenge Evasive characters on your turn
While most of the cards in here are junk, but you will be able to find the Gravekeeper's archetype, Exodia the Forbidden One cards, and some magic and trap cards