Illustrated by Grafit Studio
7Description
1 rulingYou may kill a friendly unit as an additional cost to play me. If you do, I cost 
1 Energy less for each Energy it costs and Order Rune 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 rulings
· Riot's answers, word for wordWhat 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 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.