Green ramp decks are so consistent in cube they tend to output a serious thing about as quickly as your average sort of Reanimate deck manages
It also grants you protection from everything until your next turn when it enters the battlefield, which makes it a good target for blink effects that can trigger that multiple times
Cumulative upkeep adds a second age counter and says, "Hey, pay 2." Echo says, "It's almost 5:00
Offering some cross-tribal benefits for assassins, mercenaries, and rogues, Mari seems like an excellent support card for Etrata, the Silencer due to her ability to exile enemy creatures with hit counters on them when they die
shes worked for a few other companies, including Ubisoft and Riot games
The fact that it actually gives you the option of Boggart Bog makes me strangely happy