I don't really like it - seems pretty OP. 2 quanta to turn a dragon into a dead card? Meh. Maybe "Gain -(X)|+1" a turn - fits the theme of sap (slows down but hardens), while not instantly shutting down creatures. X is up to you - maybe 2/3 upped to be the opposite of acceleration/overdrive.
There is a proposal for that sort of effect called lignify already somewhere.
2 quanta is all that lightning bolt costs (which kills lots of common dragons). It is also the more than fire lance, which is a lot more versatile being used for direct damage. Both of these can kill the special using things such at nymphs, fallen elves and other stuff, which this card is not so useful for it. Also this type of card is not so good against growers such golems and spirits, as all you do is reset not get rid of the problem.
It might be a little bit overpowered compared to reverse time. I still want to keep the same utility for casting it on your own people though. How do people feel about something like the following.
"Moves the attack of the target 4 towards 0 for each 10 life quantums in your possession."
And 5 for 10 for the upped version, same cost. So given sufficient life quanta you can still lock down a dragon, but it is harder against rushes.
So you can still make your fallen elves safe quickly and solve a good chunk of the problem of an anti-mattered creature (especially lower attack life creatures).
