Keyword · Rules Tome 2.0.8 § 602.7
Unique
You cannot bring a same-name Unique Character into play while you control one.
How it works
Full rule
Unique is checked when the Character would enter play. If you control a Character with the same name and either copy has Unique, the new copy cannot enter. The restriction is not continuously rechecked afterward.
At the table
Example
You cannot play a second Unique Character with the same name while the first remains under your control.
Watch for this
Common mistake
Unique does not mean only one copy in the deck; ordinary copy limits still apply unless another rule changes them.