Originally Posted by
Fox
You have to wait a full turn for an untap step to even make energy a resource you can use, the trigger has to resolve with this guy still having just entered play to get energy in the first place. So like Magister you spend 2 cards (also possibly 6 life), you wrath their board, and...probably just lose from that point. You're asking for a lot from this card if you think you'll be able to get 4 energy and also spend it (again that's 4 guys have to die for the value text to mean anything). A one-time wrath creature isn't good enough; Elesh is an ongoing wrath effect that also protects your life total with keyword vigilance, Ashen Rider while narrower is more likely to win in a precise scenario. This is a smaller, flying Massacre Wurm - and there's a very real chance that the drain 2 life clause would translate into more win %age. Demon of Dark Schemes is a cool card, the ideas behind it are especially neat in the limited format; but it's not going to win games for us in legacy without having Hexproof/Shroud or a novel combination like Protection from White + Trample.
On a side note, you don't always get to choose what to Reanimate based on opening hands and what a card like Careful Study finds - you will have games where this will be the first guy you have to bring back; any reanimation target has to be looked at with this in mind. Even Archetype of Endurance is a controversial inclusion in U/Bx in part b/c of this scenario (though it also lacks trample, costs 8 life, and is a bit winmore-ish since you're saying that you're comboing the second time while the first target is still in play).