*New troop* Spy

Lvl	Damage	Cost	Health	Sapper damage (PS)
1	100	100	200	60
2	130	200	260	90
3	190	300	300	110
4	220	400	400	160
5	250	500	500	230

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The Spy

I have thought of a troop called the spy. The spy is a dark elixir troop that can be used in battle.
The spy can go invisible for 3 seconds at a time (3 second cool down) and the spy can also sap defensive building making them do half the damage for 5 seconds. Also a spy's Sapper can only be used on 2 buildings in battle.
Spy's take up 10 spaces in the army camps. Tell me if there's anything I need to add to this troop!