This list runs 3 copies of 5-cost Ace, so if you want to drop the price of the deck, you can cut it down to two copies
Yes, it cost red mana to cast, but the spell itself had no observable quality to it
Theres also the aforementioned Modern Boros Energy deck which uses four copies of exactly one soul sister card, Guide of Souls
Now, Im no fool, and neither are most Magic players
The deck is usually filled with counterspells to protect your board state and also runs plenty of infinite combos with Niv-Mizzet, allowing you to draw your entire deck and burn your opponents out of the game
Its got the same kind of weird art as the Magikarp, but 20 copies of this were provided to the winner of the art contest they came from, which is especially funny because the art on this card is absolutely ridiculous