Crucible of Worlds Back in the early days of the new millennium, Wizards of the Coast ran a "You Make the Card" event through their website
Incapsula incident ID: 336000760017555952-45605131002057489
On top of that, Aurora, Dreaming Guardians three strength and five willpower pair with its two lore to make it a solid card by itself, able to likely withstand a few attacks in the early game - especially given that having Shift 3, allowing you to bring it out on top of another Aurora card for a lower ink cost, means you can have it on the field very early on
Using Luffy's ability, powerful cards can be used more often and with less risk, maintaining his momentum throughout the game
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As they are so easily used their effects have to be fairly marginal else they are broken