When Path of Mettle enters the battlefield, it deals 1 damage to each creature that doesn't have first strike, double strike, vigilance, or haste.
Whenever you attack with at least two creatures that have first strike, double strike, vigilance, and/or haste, transform Path of Mettle.
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Metzali, Tower of Triumph
(Transforms from Path of Mettle.)
T: Add one mana to any one color to your mana pool.
1R, T: Metzali, Tower of Triumph deals 2 damage to each opponent.
2W, T: Choose a creature at random that attacked this turn. Destroy that creature.