MArcomage

I played the card in turn 50. My tower was at 47 and should have gone to 40, or at least I thought it should have.

http://arcomage.net/?location=Replays_details&CurrentReplay=348386&PlayerView=1&Turn=50

There's no bug. You just have to follow the math and then acknowledge an oddity in the code that makes it look like nothing happened.

The card effect reduced your tower from 47 to 40.
After that, the Runic keyword took effect. Your opponent had attacked your tower for 7 damage, so your Rare Runic card restored that 7 tower, raising you to 47.
The system looks at your tower at the start of the turn (47) and at the end of the turn (47) and doesn't show any numbers next to it because it doesn't see that the value has changed.

Everything checks out.

Oh, OK. I didn't think of that before. Thanks, DP