It has a mana value of five, which lets it trigger Up the Beanstalk consistently as well
Let it fuel your power, and you will become an Eldrazi yourself
If a Surge Engine whose last ability has been activated leaves the battlefield and comes back, it's a new object on the battlefield and its last ability can be activated again (once it's blue, of course)
3 Yosenju Kama 1 3 Yosenju Kama 2 3 Yosenju Kama 3 3 Yosenju Izna 1 Yosenju Tsujik 1 Yosenju Oyam 1 Yosenju Kodam 3 Kagetokage 3 Yosen Training Grounds 3 Fire Formation Tenki 2 Forbidden Droplet 3 Yosenjus Sword Sting 3 Torrential Tribute 2 Drowning Mirror Force 3 By Order of the Emperor 3 Solemn Judgment 1 Number S39: Utopia the Lightning 1 Number C39: Utopia Ray 1 Number 39: Utopia 1 Dark Rebellion Xyz Dragon 1 Time Thief Redoer 1 King of the Feral Imps 1 Brotherhood of the Fire Fist Tiger King 1 Tornado Dragon 1 Harpies Pet Phantasmal Dragon 1 Diamond Dire Wolf 1 Evilswarm Exciton Knight 1 Lightning Chidori 1 Abyss Dweller 1 Gagaga Cowboy 1 Fire Fighting Daruma Doll A Yosenju Deck that focuses on Pendulum Summoning
Oko's direct impact may not be flashy, but the opponent has to answer him - and all the time they're expending resources trying to remove the three-mana planeswalker, his controller can keep building up their own board, getting further and further ahead
Crystrons were so good for so long, they have 4 different cards from their core on the Semi-Limited list