(They won't untap if they have stun counters.) While you control Fear of Sleep Paralysis, if a permanent an opponent controls with a stun counter would untap, it doesn't untap and the stun counter isn't removed
You could go to an Elf build fairly easily
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Yawgmoth is probably in the market for 2 copies and Phyrexian Tower will provide a boost to any creature sacrifice shenanigans in modern in the future
Killing a scary creature is great and all, but handing your opponent a very relevant body to do it doesnt seem like a great plan
With downtrading (trading a small number of cards for a large number of cards) you can ask for ore cards depending on how badly the other person wants your card