Bladehold War-Whip
Artifact — Equipment
For Mirrodin!
Equip abilities you activate of other Equipment cost less to activate.
Equipped creature has double strike.
Equip 
Tony Foti
Rulings
The Rebel enters the battlefield as a 2/2 creature, then the Equipment becomes attached to it. Abilities that trigger when a creature enters the battlefield see that a 2/2 creature entered the battlefield.
(wotc • 2023-02-04)
If the ability causes two Rebel tokens to be created (due to an effect such as that of Mondrak, Glory Dominus), the Equipment becomes attached to only one of them.
(wotc • 2023-02-04)
The second ability affects other Equipment even if it isn't currently attached to a creature.
(wotc • 2023-02-04)
Some Equipment creature cards in other sets have reconfigure, a different ability that attaches them to a creature. Reconfigure is not an equip ability, and reconfigure costs are not reduced by Bladehold War-Whip's second ability.
(wotc • 2023-02-04)
If the Rebel is destroyed, the Equipment stays on the battlefield. Similarly, you may pay its equip cost to move it from the Rebel token to another creature you control.
(wotc • 2023-02-04)
Bladehold War-Whip's second ability reduces only the amount of generic mana in equip abilities. For example, it will reduce an equip cost of {1} to {0}, but it will have no effect on an equip cost of {G}.
(wotc • 2023-02-04)
Rulings
The Rebel enters the battlefield as a 2/2 creature, then the Equipment becomes attached to it. Abilities that trigger when a creature enters the battlefield see that a 2/2 creature entered the battlefield.
(wotc • 2023-02-04)
If the ability causes two Rebel tokens to be created (due to an effect such as that of Mondrak, Glory Dominus), the Equipment becomes attached to only one of them.
(wotc • 2023-02-04)
The second ability affects other Equipment even if it isn't currently attached to a creature.
(wotc • 2023-02-04)
Some Equipment creature cards in other sets have reconfigure, a different ability that attaches them to a creature. Reconfigure is not an equip ability, and reconfigure costs are not reduced by Bladehold War-Whip's second ability.
(wotc • 2023-02-04)
If the Rebel is destroyed, the Equipment stays on the battlefield. Similarly, you may pay its equip cost to move it from the Rebel token to another creature you control.
(wotc • 2023-02-04)
Bladehold War-Whip's second ability reduces only the amount of generic mana in equip abilities. For example, it will reduce an equip cost of {1} to {0}, but it will have no effect on an equip cost of {G}.
(wotc • 2023-02-04)