yugioh zoodiac cards RA04-EN091 - Barrage - Quarter Century Secret Rare you can also Xyz Summon Zoodiac Boarbow by using 1 Zoodiac monster you control with a different name as Xyz Material Zoodiac Tigermortar | Card Details

If Ugins Labyrinth is indeed S tier, it will likely be in conjunction with Devourer of Destiny to get up to enough playable 7 drops to consistently get 2 mana off the Labyrinth

It doesn't matter if Oko leaves the battlefield before the ability resolves or later in the turn

Once per turn: You can banish 1 random card from your opponent's hand face-down, until your opponent's next End Phase

Then when yours swings on the next two turns you'll draw - not deal damage, but swing, and just once-per turn so this alone works for that

And, even if the opponent isnt completely wiped out right away, its a source of continuous damage