Ziva, Malicious Mindmage

Menace
At the beginning of each opponents upkeep, you
may have that player gain control of target creature another opponent controls until end of turn. If you
do, untap it and suspect it.
At the start of each opponents main phase each suspected creature they own deal damage equal to
their power to their owner.

Who knows who to trust? But do not worry, I am on
your side, always.