Gravity's Grip

At the beginning of each player's upkeep, that
player sacrifices a creature with the lowest power
among creatures they control. If two or more creatures are tied for lowest power, that player
chooses one of them.
Whenever a creature dies, each opponent loses
1 life and you gain 1 life.
At Earth's surface, the acceleration of gravity is about
9.8 metres (32 feet) per second per second.