I'm not a fan of mechanically unique cards in Secret Lairs with their limited availability, and this approach is pretty much just official card alters - fairly inoffensive
If you struggle to identify the cards, fear not, as they will be automatically translated into your native language when you hover over them in-game
Infernal Legion followed by Sinkhole is extremely powerful setting your opponent back while also effectively putting them on a clock
I dont think Standard play is likely, but well see
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
MTG is full of efficient, low-cost creatures with powerful effects