Jace's Archivist

[Subiskier]

Can you use {jace's archivist}'s ability in response to your opponent playing a creature to counter it? If it's on the stack it's not in your opponents hand anymore right? Would you literally have to announce the ability before your opponent taps mana?

[abstractApathist]

When a spell is being played, it is no longer in its owner's hand (it's on the stack), so {Jace's Archivist} will not counter it.

[Pleeb]

Even more important:  PW abilities are played at sorcery speed and only on your turn.

Ignore me. I saw Jace and thought planeswalker.