Thothozet, Mad Sister

When Thothozet, Sister of Heraldry enters the battlefield, you may search your library for a card
named Azathoth, Abyssal Harbinger. Reveal it,
put it into your hand, then shuffle.
{3}, {t}: Add a number of {c} equal to the number
of Supplicant creature tokens you control. Spend
this mana only on {x} costs.
—
"Finally, the void has answered my call!"