Use the Guardian of Noble Arms to summon more Celtic Guardians, empty your hand, use Stop Defense to let the Guardian dish out battle damage, and draw more cards. Use said cards to dish out a ridiculous amount of direct damage.
Cannot attack while you have any cards in your hand. Once per turn: You can Special Summon 1 "Celtic Guard" monster from your hand. When this attacking card inflicts battle damage to your opponent: You can draw cards equal to the number of "Celtic Guard" monsters you control.
Flip all face-down Defense Position monsters on the field face-up. Flip Effects are not activated at this time. Inflict 500 damage to your opponent for each Effect Monster on the field.
If both players have 15 or more cards in their Graveyards: Pay 1000 LP; each player swaps the cards in their Graveyard with the cards in their Deck, then shuffles their Deck. You can only activate 1 "Exchange of the Spirit" per Duel.
Select 1 of your opponent''s monsters and switch it to Attack Position. If the card is face-down, flip it face-up. If the card has a flip effect, it is activated immediately.
When exactly 1 monster with 1500 or less ATK is Special Summoned to your field while your opponent controls a face-up monster: Special Summon as many monsters as possible with the same name as the Summoned monster, from your hand, Deck, and Graveyard, in Attack Position, also your opponent Special Summons as many monsters as possible with the same name as 1 of their face-up monsters, from their hand, Deck, and Graveyard.