This is common practice in Legacy Storm decks, where all but one of the decks win conditions are found in the sideboard
Target opponent draws a card, then you put a +1/+1 counter on target creature and give it flying until end of turn
He's just a good boy, why would you do that
Counterspells with extra modes are very nice, and here we can play offense, defense, and even counter storm spells and its copies
Ive always kept it in the back of my mind, but its never seemed good enough to include in my elf decks because the warrior count has never been high enough
Again, the card is bomb and this will likely be the rarest version of the card and therefore be the most expensive