Noldor Oathkeeper
The Fall of Nargothrond #346 (x3)
Ally
[4] 1 1 2 3

If each hero you control has at least 1 Corruption Noldor Oathkeeper does not exhaust to defend.

Response: When you play Noldor Oathkeeper from your hand, place 1 Corruption on a hero you control to reduce its cost by 1.