The last time anyone saw it was right before the formation of the Order of Jukaior, in other words, right as the Order's founder, Shigeki, was experiencing the visions of the spirit realm's deterioration
Just one Bastion of Remembrance or Zulaport Cutthroat trigger adds three counters, and thus +3/+3 to this equipment
Slaughter has only been printed once, as an uncommon in the 1998 MTG set Exodus, so supply is very constrained
While I dont think Vivi is on the level of anything currently on the banlist, it does feel like a card that could be central to a future broken deck, especially if Mox Opal becomes part of the equation again
Alongside a new cycle of artifact lands in Modern Horizons 2, were also getting Thought Monitor
Heidar, Rimewind Master belongs in your snow deck to help you bounce problematic permanents back to your opponents hands, but a mono-blue commander for our snow deck just isnt it