added Winter Orb. A classic. :)

My testing with Stasis, Winter Orb and Meekstone (or Marble Titan) combos show this is working for the main cases.

res/card-pictures.txt

@@ -38,6 +38,7 @@ snow_covered_mountain.jpg        http://www.wizards.com/global/images/magic/gene
 snow_covered_mountain1.jpg       http://www.wizards.com/global/images/magic/general/snow_covered_mountain.jpg
 snow_covered_mountain2.jpg       http://www.magickartenmarkt.de/img/cards/Ice_Age/snow_covered_mountain.jpg
 snow_covered_mountain3.jpg       http://www.magickartenmarkt.de/img/cards/Ice_Age/snow_covered_mountain.jpg
+winter_orb.jpg					http://www.wizards.com/global/images/magic/general/winter_orb.jpg
 keldon_warlord.jpg				http://www.wizards.com/global/images/magic/general/keldon_warlord.jpg
 zuran_orb.jpg					http://www.wizards.com/global/images/magic/general/zuran_orb.jpg
 storm_seeker.jpg				http://www.wizards.com/global/images/magic/general/storm_seeker.jpg

res/cards.txt

@@ -1,3 +1,8 @@
+Winter Orb
+2
+Artifact
+As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.
+
 Keldon Warlord
 2 R R
 Creature Human Barbarian

src/forge/Input_Untap.java

@@ -67,8 +67,15 @@ public class Input_Untap extends Input {
     	{
     		public boolean addCard(Card c)
     		{
-        		if (isMarbleTitanInPlay())
+    			if( isMarbleTitanInPlay() && isWinterOrbInEffect() ) {
+    				return !c.isLand() && c.getNetAttack() < 3;
+    			}
+    			else if( isWinterOrbInEffect() ) {
+    				return !c.isLand();
+    			}
+    			else if (isMarbleTitanInPlay()) {
     				return c.getNetAttack() < 3;
+    			}
 
     			return true;
     		}
@@ -80,5 +87,70 @@ public class Input_Untap extends Input {
     		else c.removeExtrinsicKeyword("This card doesn't untap during your next untap step.");
 
     	}
+    	if( isWinterOrbInEffect() ) {
+    		if( AllZone.Phase.getActivePlayer().equals(Constant.Player.Computer) ) {
+    			//search for lands the computer has and only untap 1
+    			CardList landList = new CardList(p.getCards());
+    			landList = landList.filter(new CardListFilter()
+    			{
+    				public boolean addCard(Card c)
+    				{
+    					return c.isLand() && c.isTapped();
+    				}
+    			});
+    			if( landList.size() > 0 ) {
+    				landList.get(0).untap();
     			}
     		}
+    		else {
+    			Input target = new Input() {
+    				private static final long serialVersionUID = 6653677835629939465L;
+    				public void showMessage() {
+    					AllZone.Display.showMessage("Winter Orb - Select one tapped land to untap");
+    					ButtonUtil.enableOnlyCancel();
+    				}
+    				public void selectButtonCancel() {stop();}
+    				public void selectCard(Card c, PlayerZone zone) {
+    					if(c.isLand() && zone.is(Constant.Zone.Play) && c.isTapped()) {
+    						c.untap();
+    						stop();
+    					}
+    				}//selectCard()
+    			};//Input
+    			CardList landList = new CardList(p.getCards());
+    			landList = landList.filter(new CardListFilter()
+    			{
+    				public boolean addCard(Card c)
+    				{
+    					return c.isLand() && c.isTapped();
+    				}
+    			});
+    			if( landList.size() > 0 ) {
+    				AllZone.InputControl.setInput(target);
+    			}
+
+    		}
+    	}
+    }//end doUntap
+
+    
+    private boolean isWinterOrbInEffect() {
+    	CardList all = new CardList();
+    	all.addAll(AllZone.Human_Play.getCards());
+    	all.addAll(AllZone.Computer_Play.getCards());
+    	all = all.filter(new CardListFilter() {
+    		public boolean addCard(Card c) {
+    			return c.getName().equals("Winter Orb");
+    		}
+    	});
+
+    	//if multiple Winter Orbs, check that at least 1 of them is untapped
+    	for( int i = 0; i < all.size(); i++ ) {
+    		if( all.get(i).isUntapped() ) {
+    			return true;
+    		}
+    	}
+    	return false;
+    }
+
+}