The Origins of Exert Amonkhet introduced us to Exert: An exerted creature wont untap during your next untap step. For simplicity, creatures in Amonkhet could only ever exert when they attacked, and when they did it gave its controller bonus of some sort
Getting to self-wheel on EtB before flipping into a 9/9 that can fight something and generate you a decent chunk of mana, before flipping back to a self-wheel
I'll admit I was initially a little worried about Tarkir: Dragonstorm , especially when Final Fantasy card previews started to pop up first, despite Tarkir being next to release
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This is the epitome of a powerful warp card, because you can either FlickerFlicker it, draw a card and put some big haymaker onto the battlefield for free, or you might want to repeat the same process but add to your land count instead, thus making sure your next go will cheat out the huge permanent you couldn't earlier