Gideon, Reverent Warrior

Whenever you cast a creature spell, you gain life
equal to its power.
{3}{r}{g}{w}: Until end of turn, whenever you cast a permanent spell, you may pay life equal to its converted mana cost. If you do, search your
library for a creature with converted mana cost
less than or equal to the amount of life paid this
way and put it onto the battlefield, then shuffle
your library.