Volcanic Eruption (Retro) [30th Anniversary Edition] Ultra Deck - The Three Captains or play 1 of each

or play 1 of each Digimon with the [Royal Knight] trait and different names from the digivolution cards of your Digimon in the breeding area without paying the costs

Set: Legacy of Darkness Card type: Fusion/Effect Monster Rarity: Super Rare Attack: 2000 Defense: 1200 Warrior Dai Grepher + Spirit Ryu{NL}This monster can only be Fusion Summoned by the above Fusion Material Monsters

there is an additional untap step

Creatures and nonbasic lands your opponents control enter the battlefield tapped

Volcanic Eruption (Retro) [30th Anniversary Edition] Ultra Deck - The Three Captains or play 1 of eachSet: 30th Anniversary Edition Type: Sorcery Rarity: Rare Cost: {X}{U}{U}{U} Destroy X target Mountains. Volcanic Eruption deals damage to each creature and each player equal to the number of Mountains put into a graveyard this way.