RiftRef
Riftbound Unit: Atakhan. You may kill a friendly unit as an additional cost to play me. If you do, I cost [1] less for each Energy it costs and [Y] less for each Power it costs. [Ganking] (I can move from battlefield to battlefield.) When I attack, the defender must kill one of their units here.

Card Rulings

Atakhan

UNL-170/219 · Unleashed · Rare

UnitOrder
Energy
10
Might
7
Power
3

Printed Ability

You may kill a friendly unit as an additional cost to play me. If you do, I cost [1] less for each Energy it costs and [O] less for each Power it costs. [Ganking] (I can move from battlefield to battlefield.) When I attack, the defender must kill one of their units here.

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Official Context Linked to This Card

FAQ: Unleashed Rules FAQ and Clarifications

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, as long as you pay the Accelerate cost, Atakhan will enter ready, even if he kills Rek'Sai for his additional cost. This is because Accelerate creates a delayed replacement

Rules: Riftbound Core Rules (2026-07-16)

204.4.b.1. Abilities that Add resources with the Reaction keyword can be activated at any time when costs need to be paid. See rule 429. Add for more information. 204.4.c. If a player can't pay or chooses not to pay the Applied Cost , they cannot perform the associated Game Action. 205. An instruction that requires a player to pay resources or spend counters