The -3 highlights Guffs major issue: Its only great when you control a ton of planeswalkers, which usually means youre already in a winning position
Hiros stats and abilities are pretty impressive, so its not just the beautiful art that makes this card so sought after
While a very powerful spell that's brilliant for a go-wide deck, the high mana cost of Biorhythm, and the fact that it will sit in your hand, a dead card, for most of the game, has some suggesting it would now be fine in the format
Victor, Valgavoths Seneschal Victor, Valgavoth's Seneschal is bonkers in Yorion, Sky Nomad decks where you get to blink a lot of enchantments at once
They each have an ability that triggers when it enters the battlefield
For example, the commander, Isperia, Supreme Judge, may allow you to draw lots of cards if an opponent goes full send at you in combat, but there aren't a lot of ways in the deck to prevent the damage to give yourself time to play those cards