I kind of dislike Delver of Secrets and I think it was a mistake
Nibiru the Primal Being lets you tribute all the face-up monsters your opponent controls and replace them with a big rock token, which has high stats but can be handily dispatched
Special Summon as many "Vernusylph" monsters with different names as possible from your GY, but return them to the hand during the End Phase
Rare cards can be further classified into regular rare, ultra rare, secret rare, hyper rare, and so on
Keep in mind that Prophet grants your creatures flash and that with Seedborn Muse you can tutor up Quick Sliver to essentially play during everybodys turn around the circle
For example, if Davros points menacingly at an opponent with an empty hand, they can choose the discarding option and do nothing