the ultimate yugioh card Crystal Magic (Blue) - LDS1-EN117 - Ultra Rare This monster can only be Special Summoned by offering Petit Moth as a Tribute on the 6th turns after Petit Moth has been equipped with Cocoon of Evolution The Strange State of Yu-Gi-Oh

XZ-Tank Cannon X LIGHT Level 6 [ Machine / FusionEffect ] ATK 2400 DEF 2100 "X-Head Cannon" + "Z-Metal Tank" Must first be Special Summoned (from your Extra Deck) by banishing the above cards you control

Subterror Behemoth Voltelluric Weve looked at monsters with utility and attack power

Besides the obvious combo deck with Saheeli Rai, which looks to be just as good as you think it may be, Felidar Guardian may also be a welcome addition to a Panharmonicon deck

Therefore, as soon as Walrein sustains even one significant hit, it might as well be a blue doorstop at that point

Itll be important to have more decks of different types so that you wont easily be countered every time you battle someone online.