If the creature exerted has vigilance, it can attack and exert without being tapped
The resulting spell's color, mana cost, mana value, and so on are determined by only those alternative characteristics
Under the "old" rules, you did not die until the end of the current phase (regardless of your life total), so you could Contract all day long even at zero life and simply cast a game-ending Drain Life to decimate your opponent
Alpha Beats Daniel Egneus - Kate Greenaway Medal nomination New artist - Daniela Sosa
And thats what would keep Prophet contained

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