Sentinel (Units in this arena can't attack your non-Sentinel units or your base.)
On Attack: The next non-[Heroism], non-[Villainy] card you play this phase costs 2 less.

Sentinel (Units in this arena can’t attack your non-Sentinel units or your base.)

On Attack: The next non-, non- card you play this phase costs less.

Rules Clarifications:

• The cost reduction from Bendu’s “On Attack” ability remains active even if Bendu is defeated.