Ana, Martyr of Oklein

Whenever Ana, Martyr of Oklein deals combat
damage, put that many blood counters on her.
{t}, Sacrifice Ana, Martyr of Oklein: Search you library and/or graveyard for a creature card with converted mana cost X or less, where X is the
number of blood counters on Ana. Put that card
into your hand. If you searched your library this
way, shuffle it.