Quote from Ryder052 »Thanks for dropping by, Morphic_Tide
Unfortunately, most of the cards you listed just don't work for Feather.
Abnormal Endurance is okay, but Unlikely Aid is better. During an combat phase your creatures hit.
Bladebrand is inferior to Defiant Strike. If you want deathtouch, that means you're attacking into bigger threats, which means yor attacker is likely to die. Feather doesn't want targets to die.
Bleeding Edge is ok, but 3 cmc is too high. You would have to choose from casting this or another card more often than not. Fungal Infection is much more playable, but still not that impressive.
Clear the Stage way too costly and situational.
Blessing of Belzenlok is solid.
Nightmare's Thirst and Skulduggery are just bad, the former could only work in a dedicated deck.
Macabre Mockery doesn't work, creature card in a graveyard is not the same as creature you control
Undercity Uprising is so much worse than Prey Upon...
Well, overall not yet there.
Quote from Ryder052 »Build it, run some tests against current tiers and let us know about the results
I don't see it, but hey, maybe 15 years in Magic is just not enough.