Kombeir, Heir to the Reaper

Kombeir, Heir to the Reaper enters the battlefield
with X +1/+1 counters on it
{t}, Pay X life: Choose Zombie or Scarecrow. Then search your library for X cards of the chosen type
and put them into your hand. Shuffle your library.
{x}{b}{r}, {ut}: You gain X life, then you discard
X cards from your hand.