Sick Hunger

All players gain an emblem with "At the beginning of your upkeep, put a hunger counter on you for each planeswalker you control, plus one for yourself. At the beginning of your upkeep, you must tap a land for each hunger counter you have. If you don't, sacrifice all planeswalkers you control and flip this emblem. It becomes: "At the beginning of your upkeep, you lose 1 life for each land you didn't tap for this emblem's unflipped effect.""
Everybody needs some sort of feeding to survive.