That effect alone makes it one of the best stall until I combo cards for reanimator builds in Commander
Which means, yes: it scales with buffs
Every Play Booster box includes 36 packs for a total of 504 cards
A Simic planeswalker with a low mana cost, and a +1 ability to turn any artifact or creature into a 3/3 elk with no abilities, Oko can quickly diminish the value of many cards under an opponent's control
The deck then features a multitude of spells that allow you to roll dice including creatures (Celebr-8000, Chaos Channeler, Clay Golem, Earth-Cult Elemental, Herald of Hadar, Hoarding Ogre, Iron Mastiff, Lightfoot Rogue, Monoxa, Nothic, Swarming Goblins), Sorceries (Attempted Murder, Myrkul's Edict, Recruitment Drive, Thunderwave), instants (Contraband Livestock, Farideh's Fireball, Six-Sided Die), and many more
Note that both of these can kill Vees which are artifacts not something Black is good at, hence them hitting here on my first list