Ajani, Sun's Warrior

Partner with Elspeth, Desert's Blade (when Ajani enters the battlefield, you may search your library for Elspeth, Desert's Blade and put it into your hand)
First Strike
Every time you cast a creture spell,
put a +1+1 counter on Ajani.
Every time Ajani gets a +1+1 counter,
you gain 4 life.