An option would have a 2 set talisman randomly block extra turn as a passive, that way it would it would only be a chance to block extra turns. This way it would be a gamble to use these talisman. If it is a passive talisman limit it to to X number or turns.
A second option could be to inflict extra turn block on perfect hits. Maybe make it a four set talisman to make it a more specific talisman/ toon option.
There can be many other options, but try not to make it to OP as with other talisman.