Soulflayer is a rare Creature — Demon card from Pioneer Masters (PIO), collector number 110.
Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) If a creature card with flying was exiled with this creature's delve ability, this creature has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, reach, trample, and vigilance.