All of these cards are, essentially, mana rocks with a mana value of three that have a secondary ability
Going monocolor unlocks some cards like this, which S&G really take advantage of, considering you want to flood the board with multiple creatures as early as possible
5 Danitha Capashen, Paragon Danitha is a Paragon of flexibility, featuring a low mana cost and useful ability that can be put to use in a range of strategies
Ureni is the Dragon-specific commander here, letting you take a peek at the top eight cards of your deck when he enters or attacks and snagging a Dragon creature from among those cards and putting it directly into play
Spirit Squadron (White-Blue)fill the skies with a tireless cloud of vengeful Spirits
Your deck, including your commander, must meet its companion requirement