TMT-13 Leader's Talent

(Gain the next level as a sorcery to add its ability.)
Whenever you attack, put a +1/+1 counter on target attacking creature.
: Level 2
//Level_2//
Whenever a creature you control leaves the battlefield, if it had a counter on it, you gain 2 life.
: Level 3
//Level_3//
Whenever you cast a spell, put a +1/+1 counter on each creature you control.