Oxygeddon [DR04-EN074] Common Union/Effect Monster Set: Legacy of the Valiant

Set: Legacy of the Valiant Card type: Effect Monster Rarity: Super Rare Attack: 1500 Defense: 1500 This card gains 200 DEF for each "Gravekeeper's" monster in your Graveyard

but it cannot be used as a Synchro Material for a Summon

if there is a Monster Card in the Graveyard among those detached Xyz Materials

Set: Legendary Collection Kaiba Card type: Quick Play Spell Rarity: Ultra Rare When a Trap effect that inflicts damage is activated: Make that effect damage 0

You can only use this effect of "Magical Musket Mastermind Zakiel" once per turn

Oxygeddon [DR04-EN074] Common Union/Effect Monster Set: Legacy of the ValiantSet: Dark Revelation Volume 4 Card type: Effect Monster Rarity: Common Attack: 1800 Defense: 800 When this card is destroyed by battle with a Pyro Type monster and sent to the Graveyard, inflict 800 points of damage to both players.