For quick reference, Archenemy is typically played as a 3v1 game where all players use Commander Decks and one player, the titular Archenemy, has an additional deck of scheme cards, one of which is drawn each turn
This way, the user can be provided with structured data on their trading card in a matter of seconds
For this combo to work, you need both Terra and Yenna out, then you need to pay six to flip Terra into her Esper form
You get to build your board presence while milling, reap the rewards of milled cards, and build toward a one-sided board wipe that often leads to quick wins
I don't need to go into much detail here
Green started to get more and more card advantage tools in 2017 since MTGs color design philosophy elected green to be the color with more access to card advantage behind blue