Scry Token generation Treasure creation (artifact tokens with "T, Sacrifice this artifact: Add one mana of any color.") "Tutor" for a creature
When you discard an opponents card, you preemptively handle their threats or interactions
TheChirurgeon: This is very solid one-sided board wipe, and having Flashback just gives it some great value
Ob Nixilis, the Adversary Ob Nixilis, the Adversary is easily one of my favorite planeswalkers ever printed because it has one unique ability: it can copy itself at the expense of sacrificing a creature
This in turn gives you an early play that allows you to gain life for practically the entire game unless someone uses removal on it
Due to the infrequencies of the negative aspects coming up, the positives in trading are so frequent that you forget negatives exists and it just becomes all upside