A natural pairings seems to be this with Subterranean Scout, which I feel leads to a downward spiral of weak cards that serve to only further justify each other
It has a decent mana value, which allows Yurikos trigger to ding your opponents for five if it gets flipped
Two +1/+1 counters is the standard, but this particular creature is a little costly overall
If at least one creature in combat has first strike or double strike, you can activate Kaito's ninjutsu ability during the first-strike combat damage step
Plunge into Darkness 4/10 This is a Tutor to set you up or a mass sac outlet to try and close out the game
Zenos yae Galvus/ Shinryu, Transcendent Rival Zenos yae Galvus is a tricky creature to transform and the Shinryu, Transcendent Rival makes no difference in 1v1, though a huge dragon is usually relevant