Unleashed UNL-170/219 rare Official FAQ
Atakhan
Card Text & Abilities
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.
Official Rules FAQ & Clarifications
1 Official FAQ Q:
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?
A:
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 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.