Theres also a subtheme of creature tapping, evident on some of the cards in the 99
Shard of the Void Dragon This precon contains exactly two non-artifact creature cards, each depicting an avatar of the Ctan: immortal energy beings who once ruled over the Necrons as gods
Both stop any set-up, and Rest in Peace shuts down anything that they got going before it entered the battlefield, so recovery from one of these cards is going to be slow
Whilst not being as memorable or awesome as transformations, Escalate is a fine mechanic that leads to some solid gameplay choices should you play the spell early to try and gain the upper hand, or wait to cast it at its max potential later
(It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) Karns creation is now his master
It is also the hidden modality of the X variable, not just removal land but big end game high impact removal, midgame low impact lower cost removal, or land