For just one Green mana, you get a flying 0/1 that can produce mana of any color
Let him speak directly to you in two of his YouTube videos on the subject
The mana cost and expansion symbol are printed on only one side each but apply to the permanent regardless of whether it has been flipped
Paired with Blood Moon, Price of Progress, and Magus of the Moon, this strategy dismantles multicolor decks, and the fact that it can show up as early as turn 2 makes it even more dangerous
Its a bit slow, but it shines when you need to hit land drops, fix colors, or deplete your deck of lands to maximize exile effects like Wrenn's Resolve and never run into dead cards
For one thing, it's much cheaper to cast and can deal a fair bit of damage with his 7/6 statline