Emrakul, the Aeons Torn isn't easy to get into play through mana, but spells like Summoning Trap, Through the Breach, and Sneak Attack can and have been used to cheat Emrakul into play for far fewer mana
Its also an artifact that opens more synergies, depending on what your commander cares about, and a mill card

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The perfect introduction for new players, each deck also comes with a strategy insert to help you make the most of your deck's abilities and a reference card for what to do on your turn
You get to hold the slabs in your hands, talk face-to-face with knowledgeable vendors, and maybe even haggle on the price