Some might argue that Urzas Saga should be on the list, and while it can be a nice way to grab Colossus Hammer, Sol Ring or the aforementioned Masterwork of Ingenuity, its also a lot pricier than The Mycosynth Gardens
cards from World Championship decks) are allowed as long as card sleeves whose opacity sufficiently obscures the difference between the standard and nonstandard card backs are used
For many brands, a "soft" or penny sleeve is made from thin, flimsy plastic (around 30 to 40 microns) that wrinkles easily
Most sacrifice outlets require the sacrifice as the cost to an ability or as an additional cost to casting a spell, then that spell or ability goes on the stack
We use tcgplayer market price for nm, tcg low for lpnm/lp, ebay for jp, graded, or rare products