Ulamog has a bonelike, featureless head and two purple arms that split into four at the elbow
Discounting them all to the same price
Stack them so it puts all the permanents into play first to get their ETB triggers, and then exiles them again, to produce more tokens and set you up to do it again the next turn
When you factor in additional enchantment drops beyond that, things get downright silly
Players are going to crack a ton of Masters 25 packs in search of Jace, the Mind Sculptor, which is a good thing for Wizards (because they'll sell a ton of packs) and a good thing for players (since it will increase the supply of the other cards in Masters 25 , making them cheaper and more accessible)
Mostly, this is a mana sink