Being able to pay three mana to cast anything from the graveyard for a turn essentially translates to drawing a huge number of cards at a very low cost, but without the randomness that comes with actually drawing the cards
The Creatures So, why play a deck built around trying to draw at least two cards each turn
Although there are many ways to win a game of MTG, the most common is to reduce your opponent's life total to zero by dealing combat damage with your creatures
The above are all of the general rules for building a Magic: The Gathering deck
Instant ramp: Growth Spiral, Harrow, Omen of the Hunt, etc, Sorcery ramp: Into the North, Cultivate, Natures Lore, etc
And sure enough, the Teenage Mutant Ninja Turtles set had one: Rat King, Verminister