My favorite thing in Standard right now is using Transgress the Mind and Infinite Obliteration to destroy an opponents hand, destroy their best top decks, and to hasten them towards topdeck mode. Goblin Dark-Dwellers recurs Infinite Obliteration for free, and Kolaghan's Command buys back the Dark-Dwellers and makes the opponent discard as well. It's way safer in this format to deal with Thought-Knot Seer, Reality Smasher, World Breaker and Ulamog BEFORE they get cast or put onto the battlefield.
Going turn 2 Atarka's Command to drop an extra land, then turn 3 Kiora, into turn 4 Sarkhan Unbroken, then turn 5 Omnath, Locus of Rage, drop and crack a fetchland, and put two 5/5 elemental tokens into play.
Chump blocking with plant tokens from Nissa, Voice of Zendikar, then sacrificing them to Evolutionary Leap.
Casting Collected Company and finding Reflector Mage and Jace, Vryn's Prodigy.
Immediately recasting Collected Company with the newly-transformed Jace, Telepath Unbound.
Flashing in Bounding Krasis to tap down their last line of defense.
Flashing in Bounding Krasis to untap a surprise blocker. Bonus points if it's Deathmist Raptor.
Flashing in Bounding Krasis to untap Jace, Vryn's Prodigy for an extra loot to flip him and save him from removal.
Flashing in Bounding Krasis EOT and tapping itself, then untapping and proceeding as normal.
Playing a Stratus Dancer facedown. Every. Goddamn. Time.
Playing a one-of Hidden Dragonslayer facedown. Every. Goddamn. Time.
Stealing their Jace, Vryn's Prodigy with Yasova Dragonclaw and my own Jace in play, then sacrificing it because of the legend rule.
Stealing their Jace with Yasova, flipping their Jace before attacks, and then killing their Jace with attacks.
Using Jace, Telepath Unbound's +1 to shrink a Siege Rhino/Reality Smasher/Goblin Dark-Dwellers/Sylvan Advocate and then stealing it with Yasova.
Stealing their 5-land Sylvan Advocate with Yasova after hitting my sixth land drop.
Stealing a Relic Seeker with Yasova, making their own Relic Seeker renowned by beating them up with it to deny them the renowned tutor trigger, searching my library for an Equipment card knowing full well I don't play any equipment and coolly announcing "fail to find" before passing the turn back. (this actually happened)
I have no idea why anybody doesn't play Bant Company. (except if you play 4c Rally) Deck is both powerful and hella sweet.
GW ~ Angels ~ WG
Modern:
RBW ~ Shadowmancer ~ WBR
Legacy:
BUG ~ Shadow Delver ~ GUB
In the Jeskai Prowess deck I brewed for the last few weeks of KTK/FRF's Standard lifetime:
EDH: UBRJeleva | GURSurrak