Khrin, Emissary of Structure

Trample, Haste

Whenever you attack with two or more creatures, exile the top card of your library and you may cast it without paying its mana costs.

If you would draw a card other then on your draw step, exile that many cards instead and you may play them this turn.

You may cast cards from exile. If you do, pay {r}{g}{w} and discard a card. Do this only on your turn.