Basically 3 methods
1) Use vampires as said above
2) Have 3 Paleozoic Canadia
3) Have 3 Floodgate Trap Hole
This 🔥 is the new fur hires, not unbeatable, but definitely warps the meta on countering them
So, so...
I played with koaki's (with 2 diamond core only)and against them. To be honest, koaki's deck is extremely powerful BUT under some conditions: play second, begin with at least 1 diamond core, 1 Urknight/Iron core, and not playing against long standing/stall deck. For example: I win almost all the time against koaki's with Yubel deck out version. Especially because the maintenance cost.