Kiri Hyoryu used a Trial Deck 2: Savage Steel during his training fight against the Castle Store Manager. He keeps this decks and redesigns it with Armorknight Black Drake as the deck's Buddy. He uses several Size 0 monsters to support his Black Drake.
After obtaining a Dark Core Deck case, Kiri's Asgard Deck goes through some changes, mainly now using Ice Blade Joker as his Buddy. Kiri now focuses more on casting Great Spell, Ragnarok to wipe out the whole field and both player's hands to call Fenrir like his previous Deck did but now adding Ice Blade Joker to obtain an extra attacker while leaving the opponent with no way to stop his attacks and with little to no possible way to make a counterattack should they survive.
Because Fimbulwinter takes 3 turns to run out of soul during which is vulnerable to destruction, his deck keeps his original strategy to destroy Gleipnir with Breathen Gard as a backup and later uses Loki the Ehrgeiz to cast Ragnarok before the opponent gets a chance to destroy Fimbulwinter.
"Like frozen water, my power makes me tough to break. Dark Luminize! Unstoppable Ice Blizzard!"