What it does
Training lets a creature grow by attacking alongside bigger allies. When a creature with training attacks together with at least one other attacking creature that has greater power, the training creature gets a +1/+1 counter. It triggers as attackers are declared, so the boost happens immediately during the declare attackers step.
The key nuance: the comparison checks power as attackers are declared, and a creature only trains if another attacker has strictly greater power than it—equal power doesn't count. Because the counter is permanent, training creatures snowball over multiple combats. Also, the training creature itself never counts as its own "bigger ally," and if it grows past your other attackers, it stops training.
In Commander, training shines in go-wide aggressive decks where a beefy commander or token can repeatedly pump smaller attackers, building a board that gets harder to deal with each turn.










