Shapeshifter [Antiquities] Phyrexian Shapeshifter and if it would die

and if it would die this turn

Set: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {1} Mana Vault doesn't untap during your untap step

Set: Masters 25 Type: Legendary Planeswalker — Jace Rarity: Mythic Cost: {2}{U}{U} +2: Look at the top card of target player's library

and Y is half the number of Forests you control

Set: Battle for Zendikar Prerelease Promos Type: Enchantment Rarity: Rare Cost: {3}{G} Devoid (This card has no color

Shapeshifter [Antiquities] Phyrexian Shapeshifter and if it would dieSet: Antiquities Type: Artifact Creature Shapeshifter Rarity: Rare Cost: {6} As Shapeshifter enters the battlefield, choose a number between 0 and 7. At the beginning of your upkeep, you may choose a number between 0 and 7. Shapeshifter's power is equal to the last chosen number and its toughness is equal to 7 minus that number. Born like a Phoenix from the Flame, But neither Bulk nor Shape the same. Jonathan Swift, "Vanbrug's House"