Invasion of Kaladesh
I got 2 Invasions of Kaladesh on table.
Attacked one of them and removed all defense counters.
Anyway I cant play transformed Legendary Artifact. On window was description - You cant play this card. Why?
Second Invasion wasn't transformed and wasn't Legendary in this situation.
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[Deleted User] commented
Phyrexian Censor on the field would be my guess.