I like the idea but i think it is a bit clunky.
Take Orc Worker for example .... permanents are not meant to be played as instants, so their game text is not worded that way. Presumably Orc Worker will only use this part of his gametext when played as an instant ....
Each time you play a condition or possession, you may make a companion strength -2 but there is no timing on the card because it normally does not need it - when will the companion stop being strength -2? It will leave play before it has any effect as it is discarded after it is played ... it doesn't seem to hang around.
Might be just my ignornace of some rules, but it doesn't seem to quite work yet. Perhaps this ....
(Skirmish: Pay the lookout cost to play that card from your hand; then discard it from play at the end of the skirmish[/b])
or am i way off track here.