How to use

setCanGainLife

method

in

mage.players.Player

  @Override
  public boolean apply(Game game, Ability source) {
    Player player = game.getPlayer(this.targetPointer.getFirst(game, source));
    if (player != null) {
      player.setCanGainLife(false);
    }
    return true;
  }
}

@Override
public boolean apply(Game game, Ability source) {
  for(UUID playerId: this.getTargetPointer().getTargets(game, source) ) {
    Player targetPlayer = game.getPlayer(playerId);
    if (targetPlayer != null) {
      targetPlayer.setCanGainLife(false);
    }
  }
  return true;
}

switch (targetController) {
  case YOU:
    controller.setCanGainLife(false);
    break;
  case NOT_YOU:
      Player player = game.getPlayer(playerId);
      if (player != null && !player.equals(controller)) {
        player.setCanGainLife(false);
        Player player = game.getPlayer(playerId);
        if (player != null) {
          player.setCanGainLife(false);
      Player player = game.getPlayer(playerId);
      if (player != null) {
        player.setCanGainLife(false);