Interesting.
My only concern is the cost. A standard gives benefit X. For the same amount of money I could hire & equip 1,000 mercenaries for six months. I think the latter will give you more bang for buck in most cases.
Yup, that's what I was going to say - a standard action is really expensive.More than just gold cost, there's the action cost. It's a standard action to plant it.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.