Modifier uses on an attack

Can player one add modifiers to player twos attack on player three?

Hey Bryson. I’m sorry, we’ve been away from the forum when we went to Discord, so I missed your message here!

I’m sure this is a bit late, but no, you can’t play a Modifier on someone else’s card.

Only with Redirect can you indirectly do that, and it’s only for Boost if the original Action getting Redirected around is also Boostable (using those small black icons on the left of the card to know if it’s legal).

Even if you’re playing with the Anarchy card, you still can’t play Modifiers on another player’s card. Anarchy would, however, let you play a Modifier that doesn’t match those small black icons.