Kindred, the Eternal Hunters

Health: 6, Level: 3
Levels 3-4: {b}{g}: Any opponent chooses a creature he or she controls. Mark that creature.
Levels 5-7: {2}{b}{g}: Mark target creature.
Levels 7-10: {1}{b}{g}: Kindred gains a Wolf counter, then deals damage to target marked creature equal to the number of Wolf counters on them.
Whenever you kill or assist in killing a marked creature, level up.