The first two are part of a ten-card cycle that are maximized by a creature being at least two colors
If you hate your opponents as much as their dirty, expensive lands, you may want to load up on mana-producing artifacts and add Armageddon to your deck
They chose their whisperers, who heard their calls to heal the land from the ravaging of the dragon brood
Then you can -3 him twice with his starting loyalty to shoot a target dork or planeswalker for 10
As a big fan of FFXIV, Im most excited about seeing Sharlayan (which also reminds me a lot of Meletis from Magics Theros sets)
Similarly, symmetrical haymakers such as Armageddon, Smallpox, or Living End are difficult to exploit effectively and are often better left in the sideboard unless your deck is specifically built to break them