Teferi's Isle [Mirage] Friday Night Magic 2012 you may put Nether Shadow

you may put Nether Shadow onto the battlefield

and Y is half the number of Forests you control

Set: Unlimited Edition Type: Artifact Creature — Juggernaut Rarity: Uncommon Cost: {4} Juggernaut attacks each combat if able

And as he sat

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {1}{U} You may return an Island you control to its owner's hand rather than pay this spell's mana cost

Teferi's Isle [Mirage] Friday Night Magic 2012 you may put Nether ShadowSet: Mirage Type: Legendary Land Rarity: Rare Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.) Teferi's Isle enters the battlefield tapped. {T}: Add {U}{U}. The three wizards knew only that this isle held a great mysteryand that patience alone would solve it.