Added Even the Odds and reworked Feast of Blood's cast restriction.

Mage/src/main/java/mage/abilities/common/CastOnlyIfConditionIsTrueEffect.java

@@ -0,0 +1,85 @@
+/*
+ *  Copyright 2010 BetaSteward_at_googlemail.com. All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without modification, are
+ *  permitted provided that the following conditions are met:
+ *
+ *     1. Redistributions of source code must retain the above copyright notice, this list of
+ *        conditions and the following disclaimer.
+ *
+ *     2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *        of conditions and the following disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY BetaSteward_at_googlemail.com ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ *  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BetaSteward_at_googlemail.com OR
+ *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ *  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  The views and conclusions contained in the software and documentation are those of the
+ *  authors and should not be interpreted as representing official policies, either expressed
+ *  or implied, of BetaSteward_at_googlemail.com.
+ */
+package mage.abilities.common;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.abilities.effects.ContinuousRuleModifyingEffectImpl;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+
+/**
+ *
+ * @author LevelX2
+ */
+public class CastOnlyIfConditionIsTrueEffect extends ContinuousRuleModifyingEffectImpl {
+
+    private final Condition condition;
+
+    public CastOnlyIfConditionIsTrueEffect(Condition condition) {
+        super(Duration.EndOfGame, Outcome.Detriment);
+        this.condition = condition;
+        staticText = setText();
+    }
+
+    private CastOnlyIfConditionIsTrueEffect(final CastOnlyIfConditionIsTrueEffect effect) {
+        super(effect);
+        this.condition = effect.condition;
+    }
+
+    @Override
+    public boolean checksEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.CAST_SPELL;
+    }
+
+    @Override
+    public boolean applies(GameEvent event, Ability source, Game game) {
+        // has to return true, if the spell cannot be cast in the current phase / step
+        if (event.getSourceId().equals(source.getSourceId())) {
+            if (condition != null && !condition.apply(game, source)) {
+                return true;
+            }
+        }
+        return false; // cast not prevented by this effect
+    }
+
+    @Override
+    public CastOnlyIfConditionIsTrueEffect copy() {
+        return new CastOnlyIfConditionIsTrueEffect(this);
+    }
+
+    private String setText() {
+        StringBuilder sb = new StringBuilder("cast {this} only ");
+        if (condition != null) {
+            sb.append(' ').append(condition.toString());
+        }
+        return sb.toString();
+    }
+}