Back in the day, people played Ice Age/Alliances sealed deck, and had to use the worst cards imaginable to win games
But then there's Mana Drain, easily the set's best card
Once you start hitting your sixth Land drop and beyond, this card turns into an absolute monster, allowing you instead to make copies of Scute Swarm
Sorcery Color tag templates(None) Rally at the Hornburg Create two 1/1 white Human Soldier creature tokens
In the context of The Brothers War, the new keyword is excellent at providing you a way to make use of Powerstones while not punishing you for leaving all your rocks in the car before battle, which means a wide variety of Commander decks will likely be seeking to include Prototype cards in their lists
At the start of your post-combat main phase, you look at the number of cards on top of your library equal to the total life lost by opponents this turn