The key component to this is that Legolass Quick Reflexes has split second, making it so long as it is on the stack, no one can cast spells or active abilities in response unless that ability produces mana
Genome Hackings Colorless Energy requirement is what sets Mew ex apart
Spend this mana only to cast an Assassin spell or a spell that has freerunning, or to activate an ability of an Assassin source
Along the lines of unexpected mashups, March of the Machine will bring past art showcase treatments back for new cards from this set, such as the autumnal equinox art style of Innistrad: Midnight Hunt on Thalia and the Gitrog Monster
Some of this is in the volume of mechanics we include and some of this is about the choice of mechanics
The one single thread running through all of them, however, is their ability to force the opponent into an action, or prevent them from performing an action