These static defenses cost more to cast than counterspells or removal, and since you made the first move there is a risk your opponent will be able to react and play around it
If you do, the damage Channel Harm deals to that creature wont be prevented
Ease of use and locating cards : Good
Fortunately, ice works the same way everywhere
Decks interested in sacrifice effects won't do much better than this Nexus, as it gives them twice the sacrifice ammunition for every nontoken creature they play
I found a few, including Sapling Nursery, which sadly wasnt available from the MTG singles site5 I was using, so had to be cut (cool as it is, I didnt want to pay for postage for one card worth pennies!)