With the random upside of being able to unmanifest any creatures you happen to turn over
1/1 Bat creature with flying, for Desecrated Tomb and Regal Bloodlord
There are a number of Dragon-specific mana rocks that are worth including, like Carnelian Orb of Dragonkind, Lapis Orb of Dragonkind, Jade Orb of Dragonkind, Orb of Dragonkind, and Dragons Hoard
Subreddits like r/OnePieceTCG or r/OnePieceTCGMarketplace may be helpful
Depending on how long ago the card was printed, its rules text may say when this comes into play, when this enters the battlefield, or simply when this enters they all mean the same thing
Since youre in green and white, you have access to all sorts of protection spells like Heroic Intervention and Teferis Protection, letting you keep your commander nice and safe while you disrupt your opponents plans