This is a high cost for speaking with the dead, a dark curse as well, I feel this could also be played by aging the summoner, taking a year of life for every minute, but that is harsh as well. Why not just use a cheaper, less deadly way to call the dead. Now, if you could substitute the target of the curse with another in your place, you could sacrifice children in your pursuit of knowledge leaving them old men or tapped. Oh man, this is harsh if used right. Go to Comment
Chekov's Spell -- This spell has a two-fold effect. The first is to make the target item almost-unnoticeable to anyone not specifically looking for it. The second is that someone who has seen the item will remember it when they encounter a situation that would be perfectly solved by use of said item.