Ideally, you should discard 2 Leon VIV 154 with this ability so that you can deal more damage with Charizard VIV 25's main attack
Also, rare and mythic rare cards received a hologram sticker to prevent forgeries
3 Emet-Selch, Unsundered Esper Terra Gogo, Master of Mimicry Golbez, Crystal Collector Hope Estheim Joshua, Phoenix's Dominant Kefka, Court Mage Kefka, Ruler of Ruin Kuja, Genome Sorcerer Quistis Trepe Shantotto, Tactician Magician Tellah, Great Sage Terra, Magical Adept The Emperor of Palamecia The Lord Master of Hell Trance Kuja, Fate Defied Venat, Heart of Hydaelyn Vivi Ornitier Xande, Dark Mage
What you really want to do is Saw in Half your own value creature , using it as a sort of sacrifice effect that then doubles the value of that creature
It will let all of your sources deal double damage until your next turn, so that's now on your turn, you attack, your damage-based sorceries and loads more
You can win the game as per the normal ways you win Magic your opponents go to zero life, or they get decked, or some other combo kill but you can also win the game by figuring out which cards are in the Case File envelope