Combo Piece Count and Rating Commander Spellbook rates each combo with a tag: E (Exhibition), C (Core), O (Optimal), P (Powerful), S (Strong), R (Reserved/broken)
Theoretically, you could make a really good deck early on and win against the League, which is why the game doesnt let you do that and artificially gates your progress
Always buy from reputable sellers and check for official logos and trademarks on the packaging
There's also combo potential with cards like Triskelion: if you can first get a +1/+1 counter on Daggertooth then you can ping it with Trisk, proliferate both the Daggertooth and Trisk to add another +1/+1 counter to each, then repeat infinite times for infinite proliferate and an infinitely large Dino
Bonus points for being an option for the command slot, though I wouldnt particularly recommend trying to run mono-black infect (trust me, I tried)