Cthulhu, He Who Slumbers

Eminence - At the beginning of each Player's upkeep, they a 1/1 Black Cultist creature token with "spells you cast cost {1} less to cast." and "Whenever this card is tapped, discard a card at random".

Flying, Trample, Delve

Whenever you discard a card, if it had Madness, you draw a card and each player creates a 1/1 Black Cultist token with "spells you cast cost {1} less to cast." and "Whenever this card is tapped, discard a card at random".