From Scrolls Wiki
Efficiency - Spell
Ability: Target unit gets +2 Attack until end of turn. If that unit destroys another unit this turn, increase Energy by 1.
Flavor text: The best discipline conserves energy.
- Jun. 9th, 2015: Now gives unit +2 attack (up from 1).
- Jun. 19th, 2013: Added to the beta version of Scrolls.