Cost: 3

(unupped), 3

(upped)
Damage: 5 damage (unupped), 5 damage (upped)
Ability Cost: 3

(unupped), 3

(upped)
Ability: Slay target creature if it has an attack of 10 or greater (unupped), Slay target creature if it has an attack of 8 or greater.
Flying: 5/3 (unupped), 5/5(upped)
Was also thinking of naming it Goliath Killer/Slayer as well. Works with the death deck because beyond plague (which isn't that good) it allows bonewalls and vultures to grow along with creating skeletons for graveyards. Kind of a situational card though and not sure how useful it would actually be compared to arsenic.
For rainbow decks it would be a little pricey since most run 2 bonewalls and a graveyard for 15 quanta already.