Birefringence is a Grand Archive card. Compare listings from Singapore Grand Archive sellers on CardJio, then jio them on WhatsApp.
Type
Action
Subtype
Assassin / Skill
Class
Assassin
Element
Luxem
Reserve cost
2
Speed
Fast
Card Text
[Class Bonus] Target attack card in an intent of a unit you control gains "On Hit: You may have the attacker declare an additional attack. If you do, create a copy of this card in that attacker's intent."