Bosco will count himself as a legendary creature for his first ability
[8] According to the letter included with them, they were intended to settle a dispute between Wizards of the Coast and the Judge community
Youll need to control three permanents from other players to unlock Arvinox as a creature, which you can do by reanimating creatures from their graveyards, using the ability of cards like Gonti, Lord of Luxury, or with Arvinoxs own ability
If there is only one card in your library, you put it into your hand
If the Angel manages to attack a player and meets the prerequisites to trigger, they just straight up lose the game
I think this card would have been better served as an artifact that rewards you for doing something in the game