Luminate Primordial, Diluvian Primordial, Sepulchral Primordial, Molten Primordial, and Sylvan Primordial Return to Ravnica had a rare cycle of uncounterable spells (Supreme Verdict, Counterflux, Abrupt Decay, Slaughter Games, and Loxodon Smiter)
This created the perfect opening for an exploit that revolved around using Butterfly Dagger Alma over and over again with each use filling up Royal Magical Library for some free draws
Cliff requires the opponent to attack into it or send it to the Graveyard with an effect
Both of these cards needed to be banned if the Pokmon Company wanted to print any grass-type Pokmon with powerful abilities in the future
If one of the two target creatures you control is an illegal target as Tandem Takedown resolves, the other will still get +1/+0 and then deal damage equal to its power