GENTLEMEN! MORE SPOILERS!
As for playing this card, well, if I build that Nin, the Pain Artist deck with Stuffy Doll, this could make the cut. Pinging the Doll to give myself a 1/1 Squirrel and dealing 1 to an opponent seems reasonably good.
My dream here is to be going 4th in turn order, have everyone play an untapped land and pass, then I cast this on my first turn and everyone gets three basics!
The downside to that is, like most symmetrical cards, your opponents will get to untap their lands and use them before you do. That sucks, but not enough to stop me from playing this.
I'm going to hate casting this against Thraximundar, though.
Well, graveyard hate and +1/+1 counters fit those colors nicely. All rolled up into one sweet package, it's hard not to love this guy.
In short, people complain about Sensei's Divining Top slowing things down... those folks are going to HATE this guy resolving.
If the white one had Flying, it'd be much closer to this one in power, but Vigilance is poop. This card, though, will easily fit into a number of decks - Uril, Rafiq and any deck that is already having to resort to stuff like Lignify for "removal".
The political aspect of these Aruas is pretty cool though. It acts as a theft-deterrent on your own guys, but put it on a big scary beater like Blightsteel Collosus or Ulamog and you remain safe from attack... but not your opponents!
The only question is, who will be more pissed at you: The person whose creature you enchant, or the person THAT player attacks with the enchanted guy?