The closest paper comparison is something like Obsidian Fireheart, which uses a specific kind of counter to 'remind' you about the effect even if the creature dies
Which is a grand thing, Commander is all about casual play and mill is the most casual strategy if there was one
Typal Lands Another entry on this list which isnt a cycle, this covers cards like Gilt-Leaf Palace and Secluded Glen, which are perfect in typal decks for their respective creature types
For each card exiled this way, for as long as it's exiled, its owner may cast it from exile by paying rather than paying its mana cost
As for competitive rules, the player that goes first can no longer draw on their first Draw Phase
Gem Pack Vol.5 looks inexpensive at 10 CNY a pack, but the real question is whether this wave adds meaningful collector appeal or just repeats an existing foil formula