Oracle

Enchantment 

At the beginning of each player's upkeep, that player sacrifices a non-Zombie creature.
At the beginning of the end step, if no creatures are on the battlefield, sacrifice Call to the Grave.

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

9/22/2011
If a player controls no creatures, or each creature they control is a Zombie, that player does nothing when the first ability resolves.

9/22/2011
If there is at least one creature on the battlefield at the beginning of the end step, the last ability won’t trigger. If it does trigger, but a creature enters the battlefield before it resolves, the ability won’t do anything when it resolves. Call to the Grave’s controller won’t sacrifice it.

9/22/2011
In a Two-Headed Giant game, Call to the Grave will trigger twice during each team’s upkeep, once for each player. Each of the two players will sacrifice a non-Zombie creature when the ability referring to that player resolves.

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