The Fang of Critias (Green) [DLCS-EN058] Ultra Rare Dark Beginning 1 Set: Dark Beginning 1 Card

Set: Dark Beginning 1 Card type: Continuous Trap Rarity: Common This card can only be activated when "Umi" is active on the field

you can add 1 Spell Card from your Deck to your hand with "Polymerization" or Fusion in the card name

if a Spell Card is activated during your opponent's Main Phase: You can target 1 Level 4 DARK monster in your Graveyard

also negate any effect activated by your opponent that targeted a card(s) in the Pendulum Zones

whose ATK is lower than that monster's original ATK

The Fang of Critias (Green) [DLCS-EN058] Ultra Rare Dark Beginning 1 Set: Dark Beginning 1 CardSet: Dragons of Legend: The Complete Series Card type: Normal Spell Rarity: Ultra Rare (This card is also always treated as "Legendary Dragon Critias".) Send 1 Trap from your hand or field to the GY, that is listed on a Fusion Monster that can only be Special Summoned with "The Fang of Critias" (if that card is Set, reveal it), then Special Summon that Fusion Monster from your Extra Deck. You can only activate 1 "The Fang of Critias" per turn.