Jack's Knight [DR04-EN065] Rare Ultimate Rare you can send this card

you can send this card from your hand to the Graveyard during the Damage Step to have that monsters gain 1400 ATK until the End Phase

Set: Duelist League Promo Card type: Normal Spell Rarity: Super Rare Attack: 0 Defense: 0 Destroy all face-up Rock-Type monsters on the field

Set: Dark Revelation Volume 1 Card type: Fusion/Effect Monster Rarity: Rare Attack: 800 Defense: 600 "Spirit Reaper" + "Nightmare Horse" This card is not destroyed as a result of battle

but it is unaffected by other card effects

Jack's Knight [DR04-EN065] Rare Ultimate Rare you can send this cardSet: Dark Revelation Volume 4 Card type: Normal Monster Rarity: Rare Attack: 1900 Defense: 1000