The custom is not an official Pokemon card
Wrap Up River Serpent | Illustration by Christopher Moeller The best answer to how many lands you should play in Limited is actually it depends, not just 17. Though 17 is certainly the second-best answer
The player whose turn it is chooses an artifact, creature, enchantment, or land card in their hand without revealing it, then each other player in turn order does the same
After being easily defeated and killed by Divine, a Psychic Duelist and leader of the Arcadia Movement, she revives as a Dark Signer, now strong enough to defeat him and go the distance with Signer and former King Jack Atlas, only losing that duel in part thanks to Fighting from the Inside
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Finally, you can Special Summon face-up Pendulum Monsters in your Extra Deck