How to use

setGameUnderYourControl

method

in

mage.players.Player

@Override
public void endStep(Game game, UUID activePlayerId) {
  Player activePlayer = game.getPlayer(activePlayerId);
  activePlayer.setGameUnderYourControl(true);
  super.endStep(game, activePlayerId);         
}

@Override
public void resetControlAfterSpellResolve(UUID topId) {
  // for Word of Command
  Spell spell = getSpellOrLKIStack(topId);
  if (spell != null) {
    if (spell.getCommandedBy() != null) {
      UUID commandedBy = spell.getCommandedBy();
      UUID spellControllerId = null;
      if (commandedBy.equals(spell.getControllerId())) {
        spellControllerId = spell.getSpellAbility().getFirstTarget(); // i.e. resolved spell is Word of Command
      } else {
        spellControllerId = spell.getControllerId(); // i.e. resolved spell is the target opponent's spell
      }
      if (spellControllerId != null) {
        Player turnController = getPlayer(commandedBy);
        if (turnController != null) {
          Player targetPlayer = getPlayer(spellControllerId);
          if (targetPlayer != null) {
            targetPlayer.setGameUnderYourControl(true, false);
            informPlayers(turnController.getLogName() + " lost control over " + targetPlayer.getLogName());
            if (targetPlayer.getTurnControlledBy().equals(turnController.getId())) {
              turnController.getPlayersUnderYourControl().remove(targetPlayer.getId());
            }
          }
        }
      }
      spell.setCommandedBy(null);
    }
  }
}

@Override
public void controlPlayersTurn(Game game, UUID playerId) {
  Player player = game.getPlayer(playerId);
  player.setTurnControlledBy(this.getId());
  game.informPlayers(getLogName() + " controls the turn of " + player.getLogName());
  if (!playerId.equals(this.getId())) {
    this.playersUnderYourControl.add(playerId);
    if (!player.hasLeft() && !player.hasLost()) {
      player.setGameUnderYourControl(false);
    }
    DelayedTriggeredAbility ability = new AtTheEndOfTurnStepPostDelayedTriggeredAbility(new LoseControlOnOtherPlayersControllerEffect(this.getLogName(), player.getLogName()));
    ability.setSourceId(getId());
    ability.setControllerId(getId());
    game.addDelayedTriggeredAbility(ability);
  }
}

targetPlayer.setGameUnderYourControl(true, false);
if (!targetPlayer.getTurnControlledBy().equals(controller.getId())) {
  controller.getPlayersUnderYourControl().remove(targetPlayer.getId());