Vigor [Duels of the Planeswalkers] Uncommon Ally of Zendikar becomes a

Ally of Zendikar becomes a 5/5 Human Soldier Ally creature with indestructible that's still a planeswalker

Activate only if you control a Sliver

the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step

Does it reflect the future that once was or the past that can never be

Vigor [Duels of the Planeswalkers] Uncommon Ally of Zendikar becomes aSet: Duels of the Planeswalkers Type: Creature Elemental Incarnation Rarity: Rare Cost: {3}{G}{G}{G} Trample If damage would be dealt to another creature you control, prevent that damage. Put a +1 +1 counter on that creature for each 1 damage prevented this way. When Vigor is put into a graveyard from anywhere, shuffle it into its owner's library.