Reduviidae, Slayer of Monsters

First Strike, Reach
Whenever an Elf creature card is put into a graveyard from anywhere, create a 1/1 black Crow Spirit creature token with Flying and, "Sacrifice this creature: Add {b}."
Slayer's Prey — {1}{b} Reduviidae gains Deathtouch and Protection from Shapeshifters until end of turn.