a6 card sleeves K-KEEP [A6 Slim] 3 Pocket Bag sizes indicates the opening side as the first dimension Bag dimensions have +/ Perfect Fit Premium Mini American

7 Harpie's Pet Baby Dragon Harpie's Pet Baby Dragon is a solid addition to any Harpie deck

Main Deck 49 Gouki Bearhug X EARTH Level 6 [ Warrior / Effect ] ATK 2400 DEF 0 If this card is Special Summoned by the effect of a "Gouki" card, or Normal Summoned: You can target 1 face-up monster your opponent controls

Forbidden Cards Forbidden Trap Dustshoot X TRAP If your opponent has 4 or more cards in their hand: Look at your opponent's hand and choose 1 monster from it to shuffle into the Deck

So with that in mind, there is at least an argument for the Esper SentinelEsper Sentinel that is more likely to just have its cost paid, but is also more likely to stick around for the whole game

Full Armored Xyz Normal Trap Card (1) If an Xyz Monster is on the field: Immediately after this effect resolves, Xyz Summon 1 Xyz Monster