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Marnie's Grimmsnarl ex has done amazing in Japanese tournaments, pairing it up with Froslass and Munkidori to spread damage all around

"Wyvern Assault" Special Summon 3 "Elemental Wyvern Token" (Dragon/Level 3/ATK 900/DEF 900) and choose an Attribute x each one

Cyber Twin Dragon (1-2x) 2800 ATK monster that can attack twice

Since this black creature deals damage instead of losing life, it works with cards like Curiosity and Tor Wauki the Younger, plus any number of damage doublers

Those Rocky Helmets, should you swing for them, will potentially keep your opponent from whittling away Palkia ex's HP in the early game

Crusadia Testament is insanely powerful in this regard, able to stop the opponent from being able to respond to your monster effects