Conclave Mentor

Mana cost: {G}{W}
Type: Creature — Centaur Cleric
Power / toughness: 2 / 2
Set: Double Masters 2022 #195 (uncommon)
Price: $0.36 USD

If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on that creature instead.
When this creature dies, you gain life equal to its power.

Conclave Mentor has 4 printings, first in Core Set 2021 (2020). EDHREC ranks it #2,402 among Commander cards. It appears most in Shalai and Hallar decks (5,151 on EDHREC). 1 public deck on TCG runs it. It has 5 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: legal

Public decks that run Conclave Mentor

Call for Backup - March of the Machine Commander, led by Bright-Palm, Soul Awakener

Commanders that run Conclave Mentor most

Deck counts from EDHREC.

Shalai and Hallar: 5,151 decks
Lathiel, the Bounteous Dawn: 4,430 decks
Rocco, Street Chef: 3,235 decks
Hamza, Guardian of Arashin: 3,163 decks
Felothar, Dawn of the Abzan: 2,947 decks
Ghave, Guru of Spores: 2,254 decks
Bright-Palm, Soul Awakener: 2,162 decks
Marath, Will of the Wild: 2,154 decks

Often played with Conclave Mentor

Cards that show up in the same decks on EDHREC.

Rulings

2020-06-23: 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 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: 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.