gadruul, soldier's mentor

whenever a creature enters the battlefield under your control, you may pay 1. If you do, the creature enters the battlefield under your control with a +1/+1 counter on it.
Outlast {g/w} ({g/w}{t}put a +1/+1 counter on this creature)
Creatures you control with +1/+1 counters on them have mentor, first strike, and vigilance