These are promo cards from 30th ANNIVERSARY DEMON’S PACK, a pack you can order online in Japan.

VP26-JP001 Summoned Skull (Reprint; Alternative Artwork; Over Frame)

VP26-JP002 Daemon no Kongen / Archfiend’s Origin
Level 7 DARK / Fiend / Effect Monster
2500
1200
You can only use this card name’s (1), (2), and (3) effects once per turn each.
(1) If this card is in your hand: You can Tribute 1 other “Archfiend” monster from your hand or field; Special Summon this card.
(2) If this card is Normal or Special Summoned: You can Special Summon 1 Level 6 Fiend monster with 2500 ATK from your hand, Deck, or GY.
(3) When your opponent activates a monster effect and you control “Summoned Skull” (Quick Effect): You can negate the activation, and if you do, destroy that card.

VP26-JP003 Makourai / Makourai, the Lightning Strike
Quick-Play Spell Card
(This card is always treated as an “Archfiend” card.)
You can only use this card name’s (1) and (2) effects once per turn each.
(1) Target 1 “Archfiend” monster you control; it gains 600 ATK, then you can destroy all monsters your opponent controls with lower original ATK than that monster’s ATK.
(2) During your Main Phase: You can banish this card from your GY, then target 1 Level 6 Fiend monster with 2500 ATK in your GY; add it to your hand.

Source: YU-GI-OH!.jp