Shadowverse

And how many are needed? Because three worms attacked me from the rewards.

Well, there are two Zodiac Demons (I have zero), three Nachts (same), in some builds there are also three Belfegors (also zero), and then you need to craft the worms. It's easier for me to just make Belfegors and assemble the vengeance.

Added after 39 minutes
Finished a funny take-two run - 4-1, won against masters, but lost to a guy with zero rank. Although that guy clearly isn't new to arena, he just doesn't play ranked. And it's my fault, I could have played more aggressively and maybe won.