While it certainly wasnt beating the unplayable charges in Standard, The Deck of Many Things is much more viable in Commander, where it can serve as a late-game value engine
This article dives into how fight works in MTG, the best fight cards, how to build fight into a deck, and how to play against fight and win
If you really want a less, well, dishonest place to put this Horse, I suppose its a flying lifelinker that happens to buff Unicorns, which might be worth a slot in Lathiel, the Bounteous Dawn
You can use it to lock down your opponents' creatures, forcing him to walk into Wrath of God or other mass removal cards
Starting the game with one