It That Betrays Someone

When It That Betrays Someone enters the battlefield, any number of target players get a boon counter.
At the beginning of your upkeep, each player
that has a boon counter draws a card.
{2}{u}{b}{r}, {t}, Remove a boon counter from target player: Gain control of all creatures that player doesn't control until end of turn. They attack that player this turn if able.