However, other colors can get in on the action too
The biggest thing to learn are which abilities you can trigger so here are a few great examples of allies with text that includes when, whenever, and at: Katara, Bending Prodigy, South Pole Voyager, Ondu Cleric, Earth Kingdom General, and Hero of Goma Fada
Horsemanship is a new mechanic introduced this set that basically works like flying, where you can only block a horse rider with another horse rider
For just two mana, you get a 1/3 Angel with flying and an ability that can keep it in the game for a long while
In short, you want to balance the mana value of your spells to ensure you have effective spells to cast throughout the game
Smoke Spirits' Aid Wizards really needs to slow down on things that make a bajillion treasures, because it's contributing to the Commander format getting faster and faster