The Finales (Finale of Eternity, Finale of Promise, etc.) are great, but you're not likely to hit the 12 mana you need to hit X=10 on your own. To get to 12 mana in Standard, you're gonna need some help.
Nissa, Who Shakes the World can get you to 12 mana with just six lands, which turns big mana sinks like Finale of Devastation into incredible finishers. And if hitting 12 mana on turn six is too slow, you can ramp even faster with Llanowar Elves and Incubation Druid. When all else fails, casting Carnage Tyrant on turn four or five is really tricky for most decks to deal with.
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