Guide:

Early Moves

Open with Legion's Landing // Adanto, the First Fort and/or Goblin Banneret

Mentor the token as your third move if possible. If you can't get tokens, focus on mentoring. Don't sacrifice your cards too early, this isn't a full aggro deck.

Thin with Militia Bugler and look for Aurelia, Exemplar of Justice and/or Legion Warboss if you don't already have them in hand.

Mentor Chaining

Chain mentor with Legion Warboss, Boros Challenger, Sunhome Stalwart and Tajic, Legion's Edge

Swiftblade Vindicator should be your top Mentor target, followed by vamp tokens if Vindicator is unavailable, then goblin tokens as the last priority. Use Mentor on other Mentor creatures to keep the ball rolling, and try to spread the love around (i.e., don't put all your eggs in one basket).

Finishers

Play Heroic Reinforcements for tempo swing as needed. Use it wisely, it's better with more creatures on the battlefield.

Don't use Risk Factor too early. Wait until your opponent has 10 or fewer life, they almost always give you the cards. The measly 4 damage isn't worth it.

Ajani, Adversary of Tyrants is very much an optional play in this deck. I tend to use him to weed out counters, then I play Aurelia, Exemplar of Justice, who is much more effective on a stacked battlefield. Conversely, you could use Aurelia or Tajic to clear the way for Ajani. It depends on the context. All three are cards are where your victory condition lives.

Sideboard:

You can bring your lands down to 22 and pop in Deafening Clarion to handle those pesky Saproling machines. If you prefer 24 mana, replace Risk Factor, considering token creation decks aren't as draw-heavy (so you only need to match the pace of the tokens, not card draw).

Chance for Glory is a replacement for Heroic Reinforcements and is handy against control decks once you've filtered out their counters. Timing is important, though, since you don't want to get hit with Seal Away or Settle the Wreckage

Experimental Frenzy is profoundly inconsistent. However, it's a solid defense against decks with a lot of card draw/discard power mid-game.

Lightning Strike is there if you need more damaging instants. Obviously.

Response // Resurgence is such a cool card, but I rarely have the context or mana to use it properly in this deck. I originally included it as part of the core deck, but considering that it repeats the role of 2 or 3 other cards in this roster, it's redundant. However, it is very flexible and a really great finisher, so think about holding it in your sideboard all the same.

Luminous Bonds is one of those great, cheap enchantments that annihilates fat plays like Ghalta, Primal Hunger. But, again, it's all about consistency. Read the context, adjust with your sideboard wisely.