Vortex of Time (MZMU-EN009) - Maze of Muertos 1st Edition

When your opponent activates a Normal or Quick-Play Spell Card or effect, or a monster effect, while you control a Zombie monster and "Call of the Haunted" (except during the Damage Step): Your opponent tosses a coin and their activated effect becomes the following effect.
• Heads: "Your opponent must banish 1 monster they control".
• Tails: "You must banish all monsters you control".
You can only activate 1 "Vortex of Time" per turn.