This page details the Deck(s) used by Haruto Tenjo in Taylor Gorrell's fanfiction universe.
Haruto's first Deck appears to be based on space objects and phenomena, with a small focus on manipulating his "Mini Planets" while also increasing his "Gravity Gardna's" Level. This Deck is spearheaded by "Number 71: Black Hole Gate".
Haruto's second Deck, purchased from Kodoa's Card Shop, is also space-themed, but is based on space technology instead. It focuses on Xyz Summoning the powerful "Canopy Star" Xyz Monsters.