Mina Ashido, Alien Queen

Infect, shroud, go beyond
As long as Mina Ashido, Alien Queen has a -1/-1
counter on it, it has "At the beginning of your
upkeep, each opponent with a poison counter
sacrifices an artifact or enchantment. Those who
can't gain a poison counter." and "{u}{r}{g},{t}: Flip a coin. If heads, a random opponent gets
a poison counter."