While harmonious, ambitious, aggressive and smart characters match white, black, red and blue mana identities, respectively, some IPs dont have much to offer green, the color of earth and nature
If you can't, exile it, then you may cast the exiled card without paying its mana cost." Whenever an Assassin you control deals combat damage to an opponent, cloak the top card of that player's library
Its nice that the adventure side represents common themes found in those colors, so sac decks will like the black one, while spellslinger decks will play the red one, and so on
The trick is to exile something like a Mana Geyser as your second card to have access to tons of mana every time you play a Dragon's Approach
The Wise Mothman The Wise Mothman has fast become a top Sultai commander, which I attribute to its flexibility