Mechanathulu

{b}{x} Ray of Cthulhu: place one -X/-X on X cards.
{b}{b}{b}{5} Punching crush: Place a -5/-0 token on all of your opponents creature cards
To cast Mechanathulu, you must discard
The Destroyer, The Twins, and Skeletron Prime.
If you do not have these cards, you may not cast Mechanathulu.