Restricted is a term used exclusively for Vintage
Furthermore, you may think that scry lands, or lands that enter the battlefield tapped, impact the mana curve
"I tested SnapGrade on 14 cards before my last bulk PSA run
His ability to use stun counters on the most important blocker also means he's going to demand a lot of respect on his own, so Blue/Black mid-range strategies may find a lot of use for Kaito
Other Persist creatures need a little more help, but as long as you have something in play that damages your opponent when a creature dies or enters the battlefield, like Impact Tremors, its still a combo that ends the game on the spot
The Short Answer : A popular and effective way to organize Magic cards is to first sort by color, then by card type, and finally by rarity or alphabetical order