Want an instant version? Altar's Reap.
One less card, but half the mana and twice (?) the speed. Also 
... whatever, I tried. :-P
Posted By:
OmegaSerris
(10/24/2011 5:38:38 AM)
Strong, very strong. Oculus and this are going to get married after the war ends.
EDIT: I'm surprised this hasn't come up in many casual Innistrad-based decks, it works so well. Bitterheart Witch with this thing, especially with more curses on there way in DKA? Angel Of Flight Alabaster returns the sacrificed Spirit, and in W/U its in-colour in a tribal sense. Hell, pair it up with Murder Of Crows around, or use it on Moldgraf Monstrosity! And don't forget the ton of token generators in this set, like Gutter Grime!
Dang Vivisection, you interestin'.
Posted By:
Splizer
(1/25/2012 11:33:06 AM)
I run this in my artifact deck. My deck tends to enjoy moving artifacts to the graveyard (there's Myr Welder and Mimic Vat loves when my Filigree Angel goes away.. and comes back). If those options are not available I have Myr Retriever, Myr Moonvessel to at least give me a little something something extra for the sac. It's just a casual deck but I've found this card to be brilliant in it since I love to draw cards. Who doesn't.
Posted By:
Panpl
(2/19/2012 7:08:27 AM)
Perilous Research is just all around what I'd rather use. 2 mana, 2 cards, instant, can be combo'd easier.
Posted By:
NinjaShadow
(2/19/2012 7:26:26 AM)
I actually think the mana cost is fair, they just needed to make it instant speed so you could sac a chump blocker during combat. That's where Altar's Reap succeeds and this fails.
Posted By:
GlassJoetheChamp
(4/4/2012 2:45:01 PM)
Run with oculus.
Posted By:
TheWrathofShane
(8/7/2012 1:26:34 AM)
Oculus, Darkslick Drake.
And that's just in block. So many good sacrifice triggers.
Posted By:
DoragonShinzui
(4/11/2013 7:20:30 AM)
When you look at this as a common, Concentrate is not a fair comparison at all. And when you see that it's a sorcery that draws 3 cards (which instants rarely do especially at common level)
I would also say Altar's reap, perilous research and other 2-draw instants aren't a fair comparison either.
sift, amass the compounds are perfect comparisons and in most cases, they're better.. but you can play into the sacrificial sideffect to some profit, as other posters have pointed out.
Posted By:
DeadLeeCoC
(6/20/2013 12:06:30 AM)