I would do the following:
- Use Tar on Agranok
- Use Feather
- Deal 4 damage to Agranok
- Remove Feather from the game and discard Tar (I don't think you remove it, since Tar is not the card used to slay him)
- Agranok doesn't move that turn
This is how I would play it. Would love some input from Justin.
Which is how we played it.
I agree with your comments, but you did give me an idea that removing the tar card might be a suitable (and simple) penalty.
Another simple option would be Agranok is immune to Feathers