Featured in the Magic the Gathering Commander 2016 deck, Stalwart Unity, Benefactor's Draught is a very powerful cantrip. A cantrip is a card that always replaces itself in your hand by drawing a card. For 1G, drawing a card might be good enough. But this Instant also untaps all creatures on the board. If that wasn't enough, each time a creature an opponent controls blocks, you draw another card.
There are games in which you will be able to draw an incredible number of cards using this instant. Playing this card after blockers have been declared can give you an amazing amount of card advantage for only 2 mana. Timed correctly, Benefactor's Draught offers perhaps the best draw power a Green deck has ever had.
It's in the same deck that features the 4-color Commander, Kynaios and Tiro of Meletis. Because of this fact, this instant has really only seen play with that certain Commander. Only time will tell how many decks actually adopt Benefactor's Draught, but it's just too good to not see play across the format.