Dubious Gryff (Modern)

This is a very edgy deck, that revolves around Hushwing Gryff and Dubious Challenge (as of Ixalan, Tocatli Honor Guard will also work). When you cast Dubious Challenge, you will (hopefully) get Hushwing Gryff, and a creature with a huge drawback (Eater of Days, Sky Swallower, Phage the Untouchable, Leveler). Your opponent gets to choose which creature comes under their control, either Hushwing Gryff, or the creature with the huge drawback. The important thing to remember: your opponent's creature will enter the battlefield first. So if they pick Hushwing Gryff, you get the big creature, without the drawback. If they pick the big creature, they suffer the drawback, before Hushwing Gryff enters.

So either your opponent gets Phage (and loses the game), or you get Phage without the penalty. Either you get a 9/8 with flying and trample, or your opponent skips their next two turns. If your opponent is foolish enough to pick Boldwyr Heavyweights, then you get to search for any creature, and put it under your control (Without the penalty!).

The catch with this deck; it is very luck based. Of the ten cards that Dubious Challenge provides you with, one of them has to be Hushwing Gryff. Fortunately, Congregation at Dawn will give you all the right cards.

Selesnya Charm is great utility. It can be a blocker, removal, or give Phage trample. Also, Long Road Home will let you regain control of whatever creature your opponent picked.