Let´s see... I who have never reached legend (guess my top was rank 12 a few seasons ago) I would make a deck with Fel Reaver like this:
- Upon seeing Fel Reaver your opponent will want to make you waste cards instead of removing it, so you end up messing with their curve because they will try to use as many cards as possible.
- Since Fel Reaver will not be removed, if you have enough healing power, you will keep it in the game for much longer and have to take that advantage to push for damage to face or use it for trading if needed... but since big minions are expensive, your opponent ma