[CLU] Implement Sludge Titan

Introduced TargetCardAndOrCardInGraveyard, derived from the Library one.
Did not achieved everything I wanted in the tests, as the choice seems to be accepted.
Tested it live, no particular issue, you can't select more than one per category.

Mage/src/main/java/mage/target/common/TargetCardAndOrCardInGraveyard.java

@@ -0,0 +1,114 @@
+package mage.target.common;
+
+import mage.abilities.Ability;
+import mage.abilities.dynamicvalue.common.PredicateCardAssignment;
+import mage.cards.Card;
+import mage.cards.Cards;
+import mage.cards.CardsImpl;
+import mage.constants.CardType;
+import mage.filter.FilterCard;
+import mage.filter.predicate.Predicate;
+import mage.filter.predicate.Predicates;
+import mage.game.Game;
+import mage.util.CardUtil;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+
+/**
+ * @author Susucr
+ * <p>
+ * almost identical to {@link TargetCardAndOrCardInLibrary}
+ */
+public class TargetCardAndOrCardInGraveyard extends TargetCardInGraveyard {
+
+    private static FilterCard makeFilter(Predicate<? super Card> firstPredicate,
+                                         Predicate<? super Card> secondPredicate,
+                                         String filterText) {
+        FilterCard filter = new FilterCard(filterText);
+        filter.add(Predicates.or(
+                firstPredicate, secondPredicate
+        ));
+        return filter;
+    }
+
+    private static String makeFilterText(String first, String second) {
+        return CardUtil.addArticle(first) + " card and/or " + CardUtil.addArticle(second) + " card";
+    }
+
+    private final PredicateCardAssignment assignment;
+
+    /**
+     * a [firstType] card and/or a [secondType] card
+     */
+    protected TargetCardAndOrCardInGraveyard(Predicate<? super Card> firstPredicate, Predicate<? super Card> secondPredicate, String filterText) {
+        super(0, 2, makeFilter(firstPredicate, secondPredicate, filterText));
+        this.assignment = new PredicateCardAssignment(firstPredicate, secondPredicate);
+    }
+
+    public TargetCardAndOrCardInGraveyard(CardType firstType, CardType secondType) {
+        this(firstType.getPredicate(), secondType.getPredicate(), makeFilterText(
+                CardUtil.getTextWithFirstCharLowerCase(firstType.toString()),
+                CardUtil.getTextWithFirstCharLowerCase(secondType.toString())));
+    }
+
+    protected TargetCardAndOrCardInGraveyard(final TargetCardAndOrCardInGraveyard target) {
+        super(target);
+        this.assignment = target.assignment;
+    }
+
+    @Override
+    public TargetCardAndOrCardInGraveyard copy() {
+        return new TargetCardAndOrCardInGraveyard(this);
+    }
+
+    @Override
+    public boolean canTarget(UUID playerId, UUID id, Ability source, Game game) {
+        if (!super.canTarget(playerId, id, source, game)) {
+            return false;
+        }
+        Card card = game.getCard(id);
+        if (card == null) {
+            return false;
+        }
+        if (this.getTargets().isEmpty()) {
+            return true;
+        }
+        Cards cards = new CardsImpl(this.getTargets());
+        cards.add(card);
+        return assignment.getRoleCount(cards, game) >= cards.size();
+    }
+
+    @Override
+    public Set<UUID> possibleTargets(UUID sourceControllerId, Ability source, Game game) {
+        Set<UUID> possibleTargets = super.possibleTargets(sourceControllerId, source, game);
+        // assuming max targets = 2, need to expand this code if not
+        Card card = game.getCard(this.getFirstTarget());
+        if (card == null) {
+            return possibleTargets; // no further restriction if no target yet chosen
+        }
+        Cards cards = new CardsImpl(card);
+        if (assignment.getRoleCount(cards, game) == 2) {
+            // if the first chosen target is both types, no further restriction
+            return possibleTargets;
+        }
+        Set<UUID> leftPossibleTargets = new HashSet<>();
+        for (UUID possibleId : possibleTargets) {
+            Card possibleCard = game.getCard(possibleId);
+            Cards checkCards = cards.copy();
+            checkCards.add(possibleCard);
+            if (assignment.getRoleCount(checkCards, game) == 2) {
+                // if the possible target and the existing target have both types, it's legal
+                // but this prevents the case of both targets with the same type
+                leftPossibleTargets.add(possibleId);
+            }
+        }
+        return leftPossibleTargets;
+    }
+
+    @Override
+    public String getDescription() {
+        return filter.getMessage();
+    }
+}