shining treasures booster box THE GOD PACK! Opening SHINY TREASURE EX New Pokemon Cards Box! Gardevoir and Charizard Pokemon Japanese Shiny Treasure ex

Frank Karsten from Channel Fireball wrote this detailed article on how many games you need to reach Mythic

Melffy Fenny X EARTH Level 2 [ Beast / Effect ] ATK 100 DEF 300 If your opponent Normal or Special Summons a monster(s) (except during the Damage Step), or if an opponent's monster targets this card for an attack: You can return this card to the hand, then you can Special Summon 1 Beast monster from your hand, except "Melffy Fenny"

The next most valuable card is the Full Art Pikachu V, which is going for as of this writing $39.10

Minun POP Series 1 POP #12 Common Ken Sugimori Pokemon Basic Lightning Pokemon Basic Minun Close POP Series 1 #12/17 Common Pokemon Basic POP Series 1 #12/17 Rarity Common Thunder Wave L Flip a coin