The DE Slave pen card seems really powerfull. Are theses assumptions correct?
-You can use it in your turn and your opponents
-You can sacrifice units brought in the game by necromancy. If you sacrifice such a unit, it goes back into your discard and not on the bottom of your draw pile. So it can be brought back again that same turn.
-You can sacrifice developments that have become units
-You can sacrifice a unit just before it dies due to combat damage assigned to it, card effect, whatever reason.
It just seems to strong. Sacrifice a unit when it's about to die. Sacrifice a "walking sacrifice". Next turn raise it back with countess iseara, sacrifice it again. Repeat if you have a 2nd slave pen in play. In no time this 2-cost support brings in tons of resources. And an opponent without support destruction can do painfully little against it.
Please tell me I'm mistaken somewhere
.