[STX] Implemented Pop Quiz

Mage/src/main/java/mage/abilities/effects/common/LearnEffect.java

@@ -0,0 +1,46 @@
+package mage.abilities.effects.common;
+
+import mage.abilities.Ability;
+import mage.abilities.costs.common.DiscardCardCost;
+import mage.abilities.effects.OneShotEffect;
+import mage.constants.Outcome;
+import mage.constants.SubType;
+import mage.filter.FilterCard;
+import mage.game.Game;
+import mage.players.Player;
+
+/**
+ * @author TheElk801
+ */
+public class LearnEffect extends OneShotEffect {
+
+    private static final FilterCard filter = new FilterCard("Lesson card");
+
+    static {
+        filter.add(SubType.LESSON.getPredicate());
+    }
+
+    public LearnEffect() {
+        super(Outcome.Neutral);
+        staticText = "learn. <i>(You may reveal a Lesson card you own from outside the game " +
+                "and put it into your hand, or discard a card to draw a card.)</i>";
+    }
+
+    private LearnEffect(final LearnEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        return new WishEffect(filter, true).apply(game, source)
+                || new DoIfCostPaid(
+                new DrawCardSourceControllerEffect(1), new DiscardCardCost()
+        ).apply(game, source);
+    }
+
+    @Override
+    public LearnEffect copy() {
+        return new LearnEffect(this);
+    }
+}