For sure this is Wonder Mans most important card and the one you want to get out ASAP. All his events (Active Altruism, Ionic Blast and Starstruck) get boosted if you overpay them and this card can do it naturally for each of his cards once.
Active Altruism becomes 3 threat removal for 1ER or 5 threat removal for 2 ER which is really good value same with Ionic Blast which would become 2ER for 5 damage, 3ER for 7 damage or 4ER for 9 damage which is up there with the most powerful events. Starstruck is 2ER for a stun and 1 to x damage depending on Wonder Man's attack value which can be really good.
The reason it is so good is that you don't have to exhaust it so you don't need to decide which card to use it on but you can use it once on every single card you play.
This is not limited to his own hero cards so Ant-Man from Leadership and Wasp from Aggression will automatically have one more HP than you pay for. Everywhere All at Once automatically removes 3 threat from each scheme and Firebird will also automatically be over paid for to get her revive effect
This card should be your top priority to get out as Wonder Man to really increase your game