Path of Mettle // Metzali, Tower of Triumph — ruling 1

A creature that attacked and was removed from combat (such as by Spires of Orazca) still attacked, so it can be chosen at random.

Path of Mettle // Metzali, Tower of Triumph — ruling 2

Players can't take actions between choosing the creature at random and destroying it.

Path of Mettle // Metzali, Tower of Triumph — ruling 3

In a Two-Headed Giant game, Metzali's second ability causes the opposing team to lose 4 life.

Path of Mettle // Metzali, Tower of Triumph — ruling 4

Path of Mettle's first ability deals 1 damage to each creature that doesn't have any of the four listed abilities. It doesn't deal 1 damage to each creature for each ability that creature doesn't have.

Path of Mettle // Metzali, Tower of Triumph — ruling 5

For Path of Mettle's last ability to trigger, any two attacking creatures you control need to each have any one of the four listed abilities. They don't need to share one of those abilities. For example, attacking with Sun Sentinel (a creature with vigilance) and Fanatical Firebrand (a creature with haste) will cause Path of Mettle's ability to trigger, as will attacking with two Sun Sentinels.

Path of Mettle // Metzali, Tower of Triumph — ruling 6

Metzali's last ability can be activated before blockers are chosen.

Path of Mettle // Metzali, Tower of Triumph — ruling 7

Metzali's last ability can be activated after combat damage has been dealt. You'll choose a creature at random that attacked this turn and has survived combat damage.

Path of Mettle // Metzali, Tower of Triumph — ruling 8

A creature with indestructible can be chosen at random. It won't be destroyed.

Path of Mettle // Metzali, Tower of Triumph : règles, fonctionnement et interactions (MTG)

Path of Mettle // Metzali, Tower of Triumph is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

When Path of Mettle enters, 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. (Transforms from Path of Mettle.) : Add one mana of any color. , : Metzali deals 2 damage to each opponent. , : Choose a creature at random that attacked this turn. Destroy that creature.

How it works : Path of Mettle // Metzali, Tower of Triumph

Original English text — Wizards of the Coast / Scryfall

#1January 19, 2018· Wizards of the Coast
A creature that attacked and was removed from combat (such as by Spires of Orazca) still attacked, so it can be chosen at random.
No other card is named in this ruling.
#2January 19, 2018· Wizards of the Coast
Players can't take actions between choosing the creature at random and destroying it.
No other card is named in this ruling.
#3January 19, 2018· Wizards of the Coast
In a Two-Headed Giant game, Metzali's second ability causes the opposing team to lose 4 life.
No other card is named in this ruling.
#4January 19, 2018· Wizards of the Coast
Path of Mettle's first ability deals 1 damage to each creature that doesn't have any of the four listed abilities. It doesn't deal 1 damage to each creature for each ability that creature doesn't have.
No other card is named in this ruling.
#5January 19, 2018· Wizards of the Coast
For Path of Mettle's last ability to trigger, any two attacking creatures you control need to each have any one of the four listed abilities. They don't need to share one of those abilities. For example, attacking with Sun Sentinel (a creature with vigilance) and Fanatical Firebrand (a creature with haste) will cause Path of Mettle's ability to trigger, as will attacking with two Sun Sentinels.
No other card is named in this ruling.
#6January 19, 2018· Wizards of the Coast
Metzali's last ability can be activated before blockers are chosen.
No other card is named in this ruling.
#7January 19, 2018· Wizards of the Coast
Metzali's last ability can be activated after combat damage has been dealt. You'll choose a creature at random that attacked this turn and has survived combat damage.
No other card is named in this ruling.
#8January 19, 2018· Wizards of the Coast
A creature with indestructible can be chosen at random. It won't be destroyed.
No other card is named in this ruling.
#9January 19, 2018· Wizards of the Coast
A creature with hexproof can be chosen at random. It will be destroyed.
No other card is named in this ruling.
#10January 19, 2018· Wizards of the Coast
A creature that was put onto the battlefield attacking didn't attack, so it can't be chosen at random.
No other card is named in this ruling.