Rulings

• If a creature you control would enter the battlefield with a number of +1/+1 counters on it, it enters with that many plus one instead.2020-06-23
• Conclave Mentor's first ability doesn't apply to itself if it's somehow entering the battlefield with a +1/+1 counter on it.2020-06-23
• If you control two Conclave Mentors, the number of +1/+1 counters put on a creature is two plus the original number. Three Conclave Mentors add three, and so on.2020-06-23
• If two or more effects attempt to modify how many counters would be put onto a creature you control, you choose the order to apply those effects, no matter who controls the sources of those effects.2020-06-23
• Use Conclave Mentor's power as it last existed on the battlefield to determine how much life you gain.2020-06-23