Your search for "Doomcaliber Knight SJCS-EN006" revealed the following:
Doomcaliber Knight - LDS3-EN005 - Common - 1st Edition from Legendary Duelists: Season 3 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:Cannot be Special Summoned. If a monster effect is activated (Quick Effect): Tribute this face-up card;...
Doomcaliber Knight - SJCS-EN006 - Ultra Rare from Yu-Gi-Oh! Promos: Shonen Jump Championship Series Prize Cards, available at 401 Games Canada. Rarity: Ultra Rare Card Text:This card cannot be Special Summoned. When the effect of an Effect Monster is activated,...
Doomcaliber Knight - DUSA-EN056 - Ultra Rare - 1st Edition from Duelist Saga 1st Edition, available at 401 Games Canada. Rarity: Ultra Rare Card Text:Cannot be Special Summoned. During either player's turn, if a monster effect is activated: Tribute this...