I still believe that the temporal acceleration of Time is not dependent on the enemy without incorporating Darkness. I believe that this would make a fine Darkness weapon.
However thematic disagreements aside, this card feels more balanced to me now.
It's ability is set at 4|6
.
This card claims that on average over a thousand games with this card, the average extra damage per turn would be around 4|6. I think this claim is a little on the low side however playtesting would identify this and a minor cost increase would fix it if it exists.
To those out there that are wise enough to note the metagame changing effect of this card:
The metagame changing to make room for a new strategy invokes an intuitive OP response. However the changing of the metagame is not a good judge of balance until after the dust settles. The old Sundial caused an OP metagame change, the pendulums were a balanced metagame change.