This variant of Vegeta comes from Frieza Saga Z when he was killed by Frieza but later brought back with the help of the dragon balls.
His toolkit is completely focused on Offense and Buffing Saiyans at the expense of any Defensive capabilities.
Since the third balance update, his stats and Abilities were improved to make him a decent glass cannon.
Blast Buffing Toolkit
Every single one of EX Vegeta GRN’s Buffs his Blast Attack Stat. Assuming he was able to get all five active at the same time and his star levels were maxed out, EX Vegeta GRN would be able to land a Blast Attack with +90% Damage on top of a 23% Buffed base stat.
Glass cannon is an understatement with this one. Since all his Buffs go to Offense, EX Vegeta GRN relies on Equips and Team Synergy to improve his poor Defense stats.
However, because of his held Strike Arts Cards and single stat Buffing Z-Ability, this Fighter isn’t likely to be put in the core and possibly not even the bench.
Since he’s not a Super Saiyan, Frieza Force, or Goku variant, EX Vegeta GRN doesn’t have a lot of Equips and what he does have aren’t all completely optimized to his toolkit.
While this isn’t recommended, if EX Vegeta GRN is put on the core he should be put on a Team with a good Tank and Melee Fighter. This way EX Vegeta GRN can be set as the Blast Arts Card dump.
Otherwise, he makes a decent Z-Buffer from the bench.