mtg kaldheim set booster box so this is one of several places where players can get a rare or mythic rare in a single Set Booster Kaldheim Surprise!! This seems like

The activation and effects of Normal Trap Cards activated on your side of the field cannot be negated

He also comes loaded with three full planeswalker abilities, including one that gives you an emblem that makes all your Ninjas a little stronger, himself included

And yes, he had to get hit in Pioneer as well, where he was the centerpiece of a number of Elvish Mystic decks including Gerry Thompson well-built Simic Devotion: Creatures (27) 3 Llanowar Elves 2 Scavenging Ooze 3 Elvish Mystic 3 Walking Ballista 4 Jadelight Ranger 4 Hydroid Krasis 4 Gilded Goose 4 Wicked Wolf Planeswalkers (8) Lands (23) Spells (2) Theres a reason Oliver Tomajko played Oko in such high numbers in both his Modern and Legacy decks at the Players Championship

Once Vivi is massive, players can use his 0 cost mana ability to generate an oppressive amount of red or blue mana, opening the board up to some truly insane spells