There is not much that can block a big Deaths Shadow, however, many of the common removal spells of the format can take care of it, until Lurrus Deaths Shadow and the namesake deck are emblematic for how Magic is played today, interrupt your opponent, play a cheap strong threat and counter whatever your opponent tries to play against you
We could sprinkle in Elementals, Nightmares, and maybe even Dinosaurs
This can be especially helpful as newer players develop their skills and build their card collection
Since Affinity isnt doing particularly well in Modern right now, I dont see this one climbing above $3-5
Just like with Magus, decks that rely on lots of non-basic Lands like Amulet Titan can struggle in the face of Harbinger
Its a little distracting and weird, but the card is good regardless