Accelerate — Riftbound Rules

805.1.

Accelerate is a Unit ability.

805.1.a.

Accelerate is functionally short for "As you play me, you may pay [1] and 1 Power as an additional cost. If you do, I enter ready."

805.1.a.1.

If the unit has a single domain, the Power portion of the Accelerate cost can be paid only with a Power that matches the domain of the unit.

805.1.a.2.

If the unit has no domain or more than one domain, the Power portion of the Accelerate cost can be paid with [A] (a Power of any domain).

805.2.

Accelerate is an Optional Additional Cost to be paid as a player plays the unit with the ability.

805.2.a.

Accelerate costs cannot be paid while the unit is on the board, only as part of the steps of playing a card.

805.3.

Accelerate has no function while on the board.

805.4.

Multiple instances of Accelerate are redundant.

805.5.

Accelerate, and whether or not a unit has Accelerate, is a characteristic of the Unit and may be checked or referenced by other Game Effects.

805.6.

Accelerate influences the state of the unit entering the Board. It does not enter exhausted and then become ready.

805.6.a.

Accelerate will not interact with, or trigger, abilities that are affected by units becoming ready.

Related FAQ (3)

How much do I pay for an Accelerate cost?

Accelerate costs 1 energy and also 1 power of the unit's domain/color. Usually you'll do this by taking an additional ready rune of the appropriate domain/color, exhaust it, and then recycle that same rune. For example, if a fury/red unit normally costs (3) (or 3 energy) and you want to accelerate it, its total cost would be (4)(R) (or 4 energy and 1 power of the fury/red domain).

What costs does Ezreal, Prodigy reduce? Does he reduce Repeat costs? Accelerate costs? Equip costs?

Ezreal reduces optional additional costs using both "additional cost" and "may." Repeat and Accelerate qualify, but not Equip costs - that's an activation cost for an ability, so it's neither optional nor additional.

What happens if I play Atakhan from my deck with Rek'Sai, Breacher on the board? Can I pay the Accelerate cost and kill Rek'Sai for the Atakhan additional cost? Will it enter ready?

Yes, Atakhan enters ready. Accelerate creates a delayed replacement effect that causes Atakhan to enter ready. Although he lacks the Accelerate keyword when he resolves, he still has the delayed replacement effect that Accelerate generates.