What? Why does this have a 3+ rating? This card is basically terrible. The drawback is huge and it's an aura which invites 2 for 1s anyway.
What do you do when they pacify your creature? You sac him and lose both cards for 1. Same if they kill him, same if they can in any way stall or block him. Bad bad card.
To those saying I don't understand how sacrifice is a good thing - you are wrong. I understand full well how a good sacrifice outlet (low or no cost, instant speed) is a powerful part of an engine. This card isn't even a good sacrifice outlet. It happens only once on your turn, at a time you can't control and is very open to removal.
So if you're playing it as a sacrifice outlet, why aren't you playing any one of the many, many better sacrifice outlets?
If you playing it as a buff, why not play with a buff that doesn't have a big drawback.
A deck that wants exactly both those things is pretty niche and even there the card is only mediocre at both - it's a poor sacri... (see all)
Posted By:
Baconradar
(10/14/2011 5:25:39 AM)
If I don't sacrifice any creature then Oni Possession is thrown to the graveyard alone or with the creature it possess? and what does "Enchanted creature is a Demon Spirit" means? I'm new, I've only played MTG on the Xbox and I'm loving it.
Posted By:
Juparave
(7/22/2009 8:53:01 AM)
Its okay.
Posted By:
Progle
(8/11/2011 12:21:06 AM)
This would be an interesting card if it read "sacrifice another creature" (similarly to Demonic Taskmaster).
Like this I'd rather play Demonic Appetite and pass on trample and the creature type to pay 
less.
Then again, this allows you to cast it on your opponent's creature if they only have a single one and make them sacrifice it. Otherwise i probably wouldn't risk to cast it on one of their creatures since they might even benefit from it if they sacrifice one they don't need anymore and attack with a buffed trampler that you actually wanted to get rid of.
Unless you're playing cards like Intrepid Hero and Big Game Hunter, in which case you will lkely even hope that he sacrifices another creature :D Hidden Predators could be a thing in this case, too.
Posted By:
Mode
(8/26/2012 2:45:24 AM)
Its interesting to note that this is the only card to turn another nonspirit, into a Spirit (besides i beleive, Xenograft, or changeling effects) I run it in a mainly Orzhova EDH deck, along with Drogskol Captain.
Perhaps not the most powerful of decks, but flavor and always amusing.
Posted By:
Tsuichoi
(9/4/2012 12:02:51 AM)
T4 Puca's Mischief
T5 grab one of their creatures, play oni possession
T6 give them oni-possession (which is enchanting a creature you control
Now you can steal something every turn, on top of which they have to sacrifice something every turn and you get +3/+3 and trample! Kinda neat..
Works decent with mark of the oni flavor and mechanics wise. Why? You use Mark to get a beater and eventually it becomes a kill card (due to sacrifice), but you choose which turn that happens because you also control a demon.
Posted By:
blurrymadness
(6/20/2013 9:04:50 AM)
Oni Possession can do many things that Fallen Ideal can't do very well. For example, it can potentially be used outside of a heavy sacrifice deck. For example, you could use Oni Possession with Carrion Howler. First get out the howler, then next turn put this on it. Pay 4 life, attack with your 13/1 trampler. Another good creature to put it on is Mortis Dogs. Get out that guy, out put this on it, attack. Not only are you attacking them with a 7/5 trampler, but if they kill it, they lose even more life. You could even potentially sacrifice the dogs to the aura's upkeep, making the opponent lose life anyway.
Posted By:
OlvynChuru
(5/17/2014 9:52:55 AM)