Ultimate Janken

Choose any number of creatures you control. A
target opponent chooses creatures they control
equal to the number you chose. If the opponent
doesn't have enough creatures to match the
number you chose, they choose all the creatures
they control.
Play Rock, Paper, Scissors. If you win, gain control
of your opponent's chosen creatures. If you lose,
the opponent gains control of your chosen
creatures. If you tie, nothing happens.