Cogwork Tracker — ruling 1

If your draft is breaking up into multiple games, you and the noted player(s) aren't required to be in the same game.

Cogwork Tracker — ruling 2

If the noted player isn't in the game, Cogwork Tracker's last ability won't do anything, although it must still attack each turn if able. This is also true if there is no noted player because Cogwork Tracker was the first card drafted from a booster pack.

Cogwork Tracker — ruling 3

If the last ability doesn't apply, you choose which player or planeswalker Cogwork Tracker attacks.

Cogwork Tracker — ruling 4

If there are multiple noted players, perhaps because the players on both your left and right passed a Cogwork Tracker to you, you choose which of those players each Cogwork Tracker attacks. If you control more than one, they can each attack a different noted player.

Cogwork Tracker — ruling 5

If, during your declare attackers step, Cogwork Tracker is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under your control continuously since the turn began (and doesn't have haste), then it doesn't attack. If there's a cost associated with having a creature attack, you're not forced to pay that cost, so it doesn't have to attack in that case either.

Cogwork Tracker : règles, fonctionnement et interactions (MTG)

Cogwork Tracker 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

Reveal this card as you draft it and note the player who passed it to you. This creature attacks each combat if able. This creature attacks a player you noted for cards named Cogwork Tracker each combat if able.

How it works : Cogwork Tracker

Original English text — Wizards of the Coast / Scryfall

#1May 29, 2014· Wizards of the Coast
If your draft is breaking up into multiple games, you and the noted player(s) aren't required to be in the same game.
No other card is named in this ruling.
#2May 29, 2014· Wizards of the Coast
If the noted player isn't in the game, Cogwork Tracker's last ability won't do anything, although it must still attack each turn if able. This is also true if there is no noted player because Cogwork Tracker was the first card drafted from a booster pack.
No other card is named in this ruling.
#3May 29, 2014· Wizards of the Coast
If the last ability doesn't apply, you choose which player or planeswalker Cogwork Tracker attacks.
No other card is named in this ruling.
#4May 29, 2014· Wizards of the Coast
If there are multiple noted players, perhaps because the players on both your left and right passed a Cogwork Tracker to you, you choose which of those players each Cogwork Tracker attacks. If you control more than one, they can each attack a different noted player.
No other card is named in this ruling.
#5May 29, 2014· Wizards of the Coast
If, during your declare attackers step, Cogwork Tracker is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under your control continuously since the turn began (and doesn't have haste), then it doesn't attack. If there's a cost associated with having a creature attack, you're not forced to pay that cost, so it doesn't have to attack in that case either.
No other card is named in this ruling.