There are some cards, like Living End or Ancestral Vision, that have no mana cost
but you only get to keep one
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You're mostly leaning on the activated ability here for this to be a card that is worth spending 4 mana on and not adding to the board
The deck will enjoy casting heavy hitters like Blightsteel Colossus, The Millennium Calendar, and Memnarch to take over the game
Meanwhile, some of the characters you get in this deck and the synergies between other cards are down-right fun to play