i personally think that time have nothing to do with direct damage like that, but i'll like an idea as:
Delay the target creature in a time bubble for 1 turn for every 5 time quanta you own.
It was supposed to be something like the creature going through a time warp/rift, which is unstable and causes damage to the creature depending on how far in
they go. They also may not reapear for a few turns, hence the time bubble. This is the best way, imo, for
to do direct damage thematically.