Once you have a reliable way of doing do, Walking Ballista serves as both an excellent creature removal tool and a way to burn your opponents out of the game entirely
This card is one to watch as a competitive player and as a collector, too, as the Ultra Rare and Special Illustration Rare will likely pick up in price drastically
Oko's abilities are very strong and flexible, and its low casting cost and cheap loyalty costs made it scarily aggressive
If you go to 30, that shoots up to a much more comfortable 86.9%
Its still much better to go first
But some sweet synergies include Kuro, Pitlord and Horobi, Death's Wail to machine-gun down opposing creatures for 1 life per kill, Patron of the Nezumi which drains opponents, and Kagemaro, First to Suffer which is an emergency board wipe when needed