Both of these send the Spiritmonger packing, along with any other unfortunate creatures that happen to be in play at the time. Most of the decks that utilize White to any great degree already have Wrath effects either maindeck or sideboard, so this will not require any great adjustment. It's a rare, of course, which can be a problem for some people. Keep in mind, however, that this card is and will continue to be one of White's main bombs, so that an investment in 3 or 4 of them will not be wasted. Just be careful not to let yourself die to beatdown from the token.
Few things are more embarassing.
Blue For most of the other colors, the answer to Spiritmonger involves finding a way to blow the damn thing up, pure and simple. Blue, as you might expect, is a bit sneakier. To begin with, there is a rather healthy amount of bounce available. Just keep in mind that Wash Out, Hibernation and other color-based effects probably won't work as well. Once you get to five or more mana, more options become available.