You tick her up to defend her (the 5/5 elemental stays around until your next turn) and you tick her down for utility
The explosive tempo of Legacy and Vintage, unique among Constructed formats, comes from their avenues of transmuting cards into mana Black Lotus, the Moxen, Channel, Lions Eye Diamond, Dark Ritual, Lotus Petal, Grim Monolith, Cloudpost the list goes on
If I want a limited two drop counter in a budget conscious brew, I'll just run Commander Classic Negate that's splashable but heavily printed in Standard legal format as a common so it's just a quarter here for the cheapest one
Aside from the Psychic deck, Mew EX blends very well with Colorless type cards like Wigglytuff EX and Snorlax
On her website, Morii perfectly explains, My job is to appreciate and make small things. Our job today is to appreciate them right back
The other big Modern banning was Lotus Field: a land which stands alone in its ability to tap for three colored mana, and which has become a huge enabler for one of Moderns most consistent archetypes