Pretender is one of the less spectacular clones in mtg history. Only targeting your own stuff and costing 5 mana for the privilege isn't great. Auras have also failed to impress me, for a similar reason to why Pretender hasn't seemed great to me; it's really easy to get two-for-oned if your opponent isn't greedy as hell and running inadequate removal. Using auras to try and justify a card doesn't seem like the way to go. Also, 9 mana bounce discard combo with dinrova horror is a lot of mana
Mind rot isn't outright bad, mind rotting a guy on 2-3 cards is fairly good, as is double mind rotting someone. It's considered bad because when you don't get it in your opening hand, you will draw it against a guy with no cards in hand and some monster on the field, and you will be sad. Honestly, I'd probably go down to maybe one or two mind rots and add removal or inspirations because of that, but they're not bad in small quantities. Mind rots actually have seen play in standard formats where other decks were masturbating over their 7 drops and going to late game with lots of cards in hand, like the current one. I feel like roughly half the decks I play against in duels go hellbent quite quickly, so three mind rots might be too much.
True, but 9 mana isn't particularly difficult to get to in this format. Even if you don't get to the point where you can loop Pretender, copying
Dinrova Horror even just once is still pretty good.
2 for 1 potential aside, I feel like the card doesn't get the respect it deserves in the meta. Sure, it isn't particularly good for a clone effect (where is
Phantasmal Image when you need it) and is dead when your board is empty. I feel like there are a lot of good targets for it in the meta, and it can potentially allow decks to sort of "double up" (not really but sort of) on cards they can usually only run a limited supply of. Pretender may not exactly be copy 2-3 of
Baneslayer Angel for example, but in a good number of cases it functions similarly enough to function as such. It still represents the potential to get something big out under cost as well. Paying 5 mana for a
Pelakka Wurm for example isn't the most terrible thing in the world.
Sorry, went a bit off topic.
I think it may be worth messing around with them a little at least. You have a decent number of targets with ETB effects that work well to clone, and the deck has access to
Undying Evil as well, which can actually work pretty well with Pretender (allowing you to upgrade what it is cloning for
rather than bouncing it and recasting for
while still often triggering an ETB effect and potentially eating an opponents creature in the process, oh, and the +1/+1 counter).