mtg goat cards · Tales of Middle-earth Commander Tokens (TLTC) #2 · Scryfall Magic: The Gathering Search Mountainwalk (This creature cant be blocked as long as defending player controls a Mountain.) Rarity: Rare, Subtype: Goat, 3

You can see how this works, and it's a cool concept for the card's beauty & the beast theme

"Hasbro's Own Convention Will Sell You a Giant Transformer That Actually Charges Your Phone"

Two mana for an extra turn with no downside is some of the best value you can find, but with a little deck manipulation, you could cast it as an instant to take a turn out of order , too

Beneficial Auras intrinsically have a drawback

Creatures from Eldritch Moon that transform into colorless Eldrazi have the aforementioned eldritch moon for the front side and Emrakul for the back side, showing this creature has joined Emrakul's brood