Joshua, Phoenix's Dominant A solid body which can help refresh your fuel, Joshuas face really lacks a standout feature, while the back costs a lot to get to, and really is missing haste to work in aggressive decks for the 5 mana that the transform costs
Pop-up events happen in Arena all the time, offering card styles and sleeves that you cant get anywhere else as rewards for participating
Not only can it tap for absurd amounts of mana, but it also has vigilance so it can act as both an attacker and blocker on top of a mana source
However, they do buy you a couple of turns before opponents make their big attack
Talk about value town
Then the batteries run down and you forget all about them, until one night they wake you up at 3am, eyes blinking, ears twitching, and warbling like something possessed