Ghost Gal eventually teams up with Playmaker and his allies to combat Lightning and his faction of rogue AIs
It proliferates at the end of your turn, amassing tons of counters over the course of a game
Elves perform well at both casual tables and competitive pods
She can increase it with her special abilities, as long as she has cards to sacrifice (she can return them with her Elder Sign, or play them directly from there via her signature card, "Twilight Blade"), with maximum allowed number of cards giving her 6 basic Willpower, which is above normal maximum
Any go-wide decks in Boros want this, and Cat Typal decks are probably losing their minds over it
(I feel this is stronger than the original Max Metalmorph and is easier to resolve.) Decklists Below is a sample Max Metalmorph deck from the OCG that you can use as a reference point