These two excellent attacks, coupled with that very impressive art (credited as being by sowsow), explains the high value of this Gengar VMAX card, which currently sells for around $400
(2024-04-12) No player can cast spells or activate abilities in between the modes of a resolving spell
This card costs X and three green, has Convoke - meaning you can tap creatures to help you pay for the cost - and you can search your library for a creature that costs X or less and put it into play at instant speed
So, attack, hold priority, and activate his ability
In combination with other types of Energy disruption, Team Star Grunt can help put your opponent behind on Energy attachments to the point where they have a difficult time preparing to take knockouts, all while preventing the card they draw at the start of their turn from being anything more than a simple Energy attachment