[nova707]

exactly when does an attacking creature tap during the combat phase, is at the declare attacker, declare blocker, or damage step or at the end of combat. then when can i use the order's ability thx. 

[UnityAlex]

Attackers become tapped during the declare attackers step.

308.2. To declare attackers, the active player follows the steps below, in order. If at any point during the
declaration of attackers, the active player is unable to comply with any of the steps listed below, the
declaration was illegal; the game returns to the moment before the declaration (see rule 422,
“Handling Illegal Actions,” and rule 500, “Legal Attacks and Blocks”).

308.2a The active player chooses which creatures that he or she controls, if any, will attack. The
chosen creatures must be untapped, and each one must either have haste or have been controlled
by the active player continuously since the beginning of the turn. For each of the chosen
creatures, the active player chooses an opponent or a planeswalker controlled by an opponent
for that creature to attack. Then he or she determines whether this set of attackers is legal. (See
rule 500, “Legal Attacks and Blocks.”)

308.2b If any of the chosen creatures have banding or a bands with other ability, the active player
announces which creatures, if any, are banded with which. (See rule 502.10, “Banding.”)

308.2c The active player taps the chosen creatures. Tapping a creature when it’s declared as an
attacker isn’t a cost; attacking simply causes creatures to become tapped.

308.2d If any of the creatures require paying costs to attack, the active player determines the total cost to attack. Costs may include paying mana, tapping permanents, sacrificing permanents, discarding cards, and so on. Once the total cost is determined, it becomes “locked in.” If effects would change the total cost after this time, ignore this change.

308.2e If any of the costs require mana, the active player then has a chance to play mana abilities
(see rule 411, “Playing Mana Abilities”).

308.2f Once the player has enough mana in his or her mana pool, he or she pays all costs in any order. Partial payments are not allowed.

308.2g Each chosen creature becomes an attacking creature if all costs have been paid, but only if it’s still controlled by the active player. It remains an attacking creature until it’s removed from combat or the combat phase ends, whichever comes first. See rule 306.4.

[Eruditious]

You can use the Order's ability as soon as it becomes tapped, if you wish. You can do it before moving on to the declare blocker step.

[bushwhacker2k]

308.2. To declare attackers, the active player follows the steps below, in order. If at any point during the
declaration of attackers, the active player is unable to comply with any of the steps listed below, the
declaration was illegal; the game returns to the moment before the declaration (see rule 422,
“Handling Illegal Actions,” and rule 500, “Legal Attacks and Blocks”).

308.2a The active player chooses which creatures that he or she controls, if any, will attack. The
chosen creatures must be untapped, and each one must either have haste or have been controlled
by the active player continuously since the beginning of the turn. For each of the chosen
creatures, the active player chooses an opponent or a planeswalker controlled by an opponent
for that creature to attack. Then he or she determines whether this set of attackers is legal. (See
rule 500, “Legal Attacks and Blocks.”)

308.2b If any of the chosen creatures have banding or a bands with other ability, the active player
announces which creatures, if any, are banded with which. (See rule 502.10, “Banding.”)

308.2c The active player taps the chosen creatures. Tapping a creature when it’s declared as an
attacker isn’t a cost; attacking simply causes creatures to become tapped.

308.2d If any of the creatures require paying costs to attack, the active player determines the total cost to attack. Costs may include paying mana, tapping permanents, sacrificing permanents, discarding cards, and so on. Once the total cost is determined, it becomes “locked in.” If effects would change the total cost after this time, ignore this change.

308.2e If any of the costs require mana, the active player then has a chance to play mana abilities
(see rule 411, “Playing Mana Abilities”).

308.2f Once the player has enough mana in his or her mana pool, he or she pays all costs in any order. Partial payments are not allowed.

308.2g Each chosen creature becomes an attacking creature if all costs have been paid, but only if it’s still controlled by the active player. It remains an attacking creature until it’s removed from combat or the combat phase ends, whichever comes first. See rule 306.4.

*Gapes* where did you read this? This is extensive... big word ftw

[Lythand]

Quote

308.2. To declare attackers, the active player follows the steps below, in order. If at any point during the
declaration of attackers, the active player is unable to comply with any of the steps listed below, the
declaration was illegal; the game returns to the moment before the declaration (see rule 422,
“Handling Illegal Actions,” and rule 500, “Legal Attacks and Blocks”).

308.2a The active player chooses which creatures that he or she controls, if any, will attack. The
chosen creatures must be untapped, and each one must either have haste or have been controlled
by the active player continuously since the beginning of the turn. For each of the chosen
creatures, the active player chooses an opponent or a planeswalker controlled by an opponent
for that creature to attack. Then he or she determines whether this set of attackers is legal. (See
rule 500, “Legal Attacks and Blocks.”)

308.2b If any of the chosen creatures have banding or a bands with other ability, the active player
announces which creatures, if any, are banded with which. (See rule 502.10, “Banding.”)

308.2c The active player taps the chosen creatures. Tapping a creature when it’s declared as an
attacker isn’t a cost; attacking simply causes creatures to become tapped.

308.2d If any of the creatures require paying costs to attack, the active player determines the total cost to attack. Costs may include paying mana, tapping permanents, sacrificing permanents, discarding cards, and so on. Once the total cost is determined, it becomes “locked in.” If effects would change the total cost after this time, ignore this change.

308.2e If any of the costs require mana, the active player then has a chance to play mana abilities
(see rule 411, “Playing Mana Abilities”).

308.2f Once the player has enough mana in his or her mana pool, he or she pays all costs in any order. Partial payments are not allowed.

308.2g Each chosen creature becomes an attacking creature if all costs have been paid, but only if it’s still controlled by the active player. It remains an attacking creature until it’s removed from combat or the combat phase ends, whichever comes first. See rule 306.4.

*Gapes* where did you read this? This is extensive... big word ftw

I believe that there states that it is tapped during the declared attackers step.