Nice pair here
508.1b The bottom half of a flip card contains an alternative name, text box, type line, power, and toughness
Force of Despair showing Squidward looking sadly out the window may work with the card's name, but has little to do with its mechanic of destroying creatures (unless I missed a particularly violent SpongeBob episode)
Meanwhile, on the less monstrous side of things, the more human-focused forces of Innistrad might have the ability keyword Coven, which can cause a unique ability if you control three or more creatures with different powers when its triggered
One common sentiment Ive seen around these decks is players planning to leave them entirely unaltered in order to play them in a group against each other, leaving the consistent art of the decks intact
it was first changed to "unaffected by summoning sickness" in Mirage and then replaced with the keyword Haste in Urza's Destiny