I think its most interesting home could be in a Standard control deck, however - in a two color strategy with a solid manabase, this card provides card draw over a few turns , a board presence or a blocker for one life, or a Treasure token to eventually ramp into game-winning spells
There are tons of cards to wade through and since not all of them work together, getting the harmony of your decks cards can take some time to assemble and get used to
However, if you do, and that creature card is an illegal target at the time Mourner's Surprise tries to resolve, it won't resolve and none of its effects will happen
And, being Magic cards, they are on average also bringing a pretty high art quality
I dont even have Increasing Vengeance