Unfortunately, when we see this effect completely absent of an upfront power boost, it hasnt really played super well
Players play cards that represent Marquis agents, sending them on missions to defeat associated enemy cards
However, when you're attacking, you want to check your active card's attack options to see how many energy cards they cost to complete an attack and how much damage that attack will do on your opponent's card
Your opponent says, "Because you're playing banned cards in your deck, I hope you contract an annoying but non-deadly disease." You say, "Gotcha!" ( Contract is a homograph of contract ) GOOD
Osgood, Operation Double Osgood, Operation Double gets a nod for making two creatures with relevant mana abilities for artifact decks and being able to investigate via the paradox ability word