@Stoneface In the timing chart, between steps 6 & 7, the determination of "Did the attack hit?" is made. If that's a "Yes", an Ion token is assigned (possibly triggering Dace, and then possibly Jostero). I think you're with me so far. If I understand you correctly, you're saying that after this point, there is no more "defender" and therefore Jostero can trigger from Dace's ability. I disagree. In step 7 itself (after the Dace-window triggering moment of "Did the attack hit?"), parts iii and iv still refer to a "defender". So long as there is a "defender", Jostero does not trigger.
EDIT: sorry, I misread you, Stoneface. You're saying Ion and Dace apply "After attacking". I'm suggesting that's not what Dace's card says. His ability triggers when the Ion is applied, which is, I think when the "hit" is determined, in the box between 6 & 7.
Edited by Incard