Yes, There was actually a point in time where Magic actually almost added a sixth color
However, they have also begun to include the Saga Elspeth Conquers Death as a means of controlling opponents' boards, taking advantage of Fires of Invention to circumvent the expensive mana cost attached to the card
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Quirion Ranger Quirion Ranger is a fantastic ramp piece in decks with mana dorks
Any enchantment-matters decks will like the price, and youll eventually get a nice raft of cards if you can identify the person likely to lose first like, I dunno, another curse player and slap this on them