Teferi, Time Raveler Playing Teferi, Time Raveler turn 3 on the play and bouncing your opponents 2-drop doesnt literally win the game, but it often feels like it, putting you in an amazing spot
In the unusual case where Unwilling Vessel has +1/+1 counters on it and then receives an amount of -1/-1 counters that causes it to die, use the total number of counters that were on Unwilling Vessel when it died, including all of the +1/+1 and -1/-1 counters, to determine the value of X
Yep, it gets Dockside
Dev-wise, Nocturnal Costumed Onslaught (which reads like a MaRo joke) is likely better at uncommon, where it's even easier to justify being a whole lot cheaper
It gives you the infinite hand size benefit, but it also has power and toughness that care about the cards in your hand
There's plenty of powerful synergies to play with, such as untapping him for repeat activations with Dross Scorpion or adding even better sac fodder like Cathodion for tons of mana