Agala, Princess of Nightmares

Infect, Vigilance
{2}{u}{b}: Create a 6/2 blue and black Nightmare creature token with Infect
During your end step, if you both own and
control Agala, Princess of Nightmares and a
creature named Ragdarrax, Lord of Demons,
exile them, then meld them into Aglarrax,
Ruler of Darkness.