What it does
Mentor triggers when a creature with the ability attacks. You put a +1/+1 counter on another attacking creature, but only one with lesser power than the mentor creature. So a 3/3 mentor can boost a 2/2 attacker, making it a 3/3—and that creature could then receive mentor counters from larger attackers too.
The most common mistake: people think any attacker can be boosted. It must have strictly less power at the time the trigger resolves. Equal power doesn't qualify. Also, the mentor creature must actually attack—it doesn't trigger from just being on the battlefield.
In Commander, mentor rewards go-wide aggressive boards. Order your triggers cleverly: resolve your biggest mentor first so smaller creatures grow, potentially enabling their own mentor triggers to still apply down the chain. It snowballs token strategies surprisingly fast.
Iconic cards with Mentor
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