Scenario:
Me: Rod of Smiting + Templar Ally on the field (Rod has 3 attack)
Opponent: Rod of Smiting with no Templar Ally (Rod has 2 attack)

Bug: Me attacking the opposing player causes his Rod to have 3 attack during the attack/defense phase but returns to normal afterward. The opponent attacking me (without a Templar) does not cause the bug to activate.

Very minor and hard to come by (Threbin decks are rare!) but should take some looking into. To see the bug in action watch my last match against BP LeviosaBlade (IGN: Ganjamus).