How to use

mage.abilities.common.ExertCreatureControllerTriggeredAbility

constructor

@Override
public ExertCreatureControllerTriggeredAbility copy() {
  return new ExertCreatureControllerTriggeredAbility(this);
}

public BattlefieldScavenger(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{R}");
  this.subtype.add(SubType.JACKAL, SubType.ROGUE);
  this.power = new MageInt(2);
  this.toughness = new MageInt(2);
  // You may exert Battlefield Scavenger as it attacks.
  this.addAbility(new ExertAbility(null, false));
  // Whenever you exert a creature, you may discard a card. If you do, draw a card.
  this.addAbility(new ExertCreatureControllerTriggeredAbility(new RummageEffect()));
}

public TrueheartTwins(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{4}{R}");
  
  this.subtype.add(SubType.JACKAL);
  this.subtype.add(SubType.WARRIOR);
  this.power = new MageInt(4);
  this.toughness = new MageInt(4);
  // You may exert Trueheart Twins as it attacks.
  this.addAbility(new ExertAbility(null, false));
  // Whenever you exert a creature, creatures you control get +1/+0 until end of turn.
  this.addAbility(new ExertCreatureControllerTriggeredAbility(new BoostControlledEffect(1, 0, Duration.EndOfTurn)));
}

public ResoluteSurvivors(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{R}{W}");
  this.subtype.add(SubType.HUMAN);
  this.subtype.add(SubType.WARRIOR);
  this.power = new MageInt(3);
  this.toughness = new MageInt(3);
  // You may exert Resolute Survivors as it attacks.
  this.addAbility(new ExertAbility(null, false));
  // Whenever you exert a creature, Resolute Survivors deals 1 damage to each opponent and you gain 1 life.
  Effect effect = new LoseLifeOpponentsEffect(1);
  effect.setText("Whenever you exert a creature, {this} deals 1 damage to each opponent");
  Ability ability = new ExertCreatureControllerTriggeredAbility(effect);
  effect = new GainLifeEffect(1);
  effect.setText("and you gain 1 life");
  ability.addEffect(effect);
  this.addAbility(ability);
}