Ulamog, the Ceaseless Hunger + Temur Battle Rage

[RoadKitten]

Ulamog, the Ceaseless Hunger forces your opponent to exile the top 20 cards of his/her library every time he attacks. Temur Battle Rage will give Ulamog double strike. If I cast Temur Battle Rage on Ulamog and attack with it, will it count as attacking twice, therefore forcing my opponent to exile the top 40 cards of his library (assuming he/she survives the attack)?

[Koby]

Ulamog, the Ceaseless Hunger forces your opponent to exile the top 20 cards of his/her library every time he attacks. Temur Battle Rage will give Ulamog double strike. If I cast Temur Battle Rage on Ulamog and attack with it, will it count as attacking twice, therefore forcing my opponent to exile the top 40 cards of his library (assuming he/she survives the attack)?

702.4. Double Strike

702.4a. Double strike is a static ability that modifies the rules for the combat damage step. (See rule 510, "Combat Damage Step.")

702.4b. If at least one attacking or blocking creature has first strike (see rule 702.7) or double strike as the combat damage step begins, the only creatures that assign combat damage in that step are those with first strike or double strike. After that step, instead of proceeding to the end of combat step, the phase gets a second combat damage step. The only creatures that assign combat damage in that step are the remaining attackers and blockers that had neither first strike nor double strike as the first combat damage step began, as well as the remaining attackers and blockers that currently have double strike. After that step, the phase proceeds to the end of combat step.

702.4c. Removing double strike from a creature during the first combat damage step will stop it from assigning combat damage in the second combat damage step.

702.4d. Giving double strike to a creature with first strike after it has already dealt combat damage in the first combat damage step will allow the creature to assign combat damage in the second combat damage step.

702.4e. Multiple instances of double strike on the same creature are redundant.

Creatures with double strike are only attacking once, but deal their damage twice.

[RoadKitten]

Cool, thanks for clarifying!