Slickshot Show-Off is destined for great things in Standard, and perhaps it'll have an impact on older formats like Pioneer or even Modern too
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You can, at instant speed, do three things, but the Mana Leak won't counter anything, so what this does instead is bounce up to three things which can set back folks deeply, bounce two and replace itself, draw three cards when the bounce isn't needed, or bounce once and draw twice
After looking at their cards, the players - starting with the first player - can choose to return any number of cards from their hand to the bottom of their deck (without revealing them) and redraw the same number of cards to leave them with a hand of seven
Its a cool idea, and better executed here than in previous sets, but you are still hurting by playing against the flow of this slower, less aggressive format
You'll need a lot of dice, because when you attack with Okinec he'll put 9999 +1/+1 counters on your Jumbo Cactuar