One, because its on the Reserved List, as all these cards are
In order to answer that question it's it makes sense to delve into the history of the mechanic and its cards
Group Hug is better than ever, so perhaps pick one of these for your next Commander deck
As another example, if my opening hand has a one-drop, a two-drop, a three-drop and four different four-drops, then I will usually bottom the worst three four-drops in the hope of drawing into a powerful five or six-drop, while keeping the cards that will ensure a perfect 1-2-3-4 curve-out
Below is a summary table showcasing the 25 most played new-to-Standard cards based on the decklists I analyzed
(2025-06-06) If The Darkness Crystal leaves the battlefield at the same time as one or more nontoken creatures an opponent controls would die, those creature cards will be exiled and you'll gain 2 life for each of them