What do you think of Welcoming Vampire and all the Commander Set Booster cards
Getting to at least seven cards in the graveyard isnt too hard, especially in a spellslinger deck, so drawing those three cards will be easy
For everyone else, their value will depend more on the general utility and efficiency of their effect rather than the highly specific hoops youre jumping through to get there
Some of the spells destroy creatures, others exile them, and recently, blue has gained the ability to remove artifacts (see Ravenform)
(Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) Each enchantment card in your hand has miracle
MTG has instants that can counter your opponents spells and turn the game around quickly, like Deflecting Swat (CMM-698)