Vintage decks can run even fewer, relying on Power 9 mana rocks and Sol Ring/Mana Crypt to generate fast mana
However, upon reaching Player Level 9, you can upgrade that card to Divine Fervor, which gives all friendly creatures +1/+1, allowing greater support for any creatures you have on the field
And its for good reason: this is a Tidespout Tyrant for the modern age
This is legal in Legacy, this is legal in Modern, and Merfolk is a deck people play in those formats sometimes
If Gogo copies a legendary creature, Gogo will also be legendary, but because its name remains Gogo, Mysterious Mime, the "legend rule" won't cause either of them to be put into the graveyard
And it has the ability to be untapped and given hexproof in exchange for returning one of your lands to your hand