Urborg Lhurgoyf prescience
Urborg Lhurgoyf has its power equal to the number of creatures in the graveyard and its toughness equal to this number + 1. When kicked, 3 or 6 cards are milled as he enters the battlefield.
Newly cast Urborg Lhurgoyfes know how many creatures will be milled this way even before the cards are releaved. This is incoherent with the behavior of all other in-game counters that depend on the graveyard state (even other Urborg Lhurgoyfes already in play).
Expected behavior is that the values on the card should be updated only after the milling animation is completed and the milled cards revealed.
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[Deleted User] commented
The cards are milled as the Urborg Lhurgoyf enters, not when it enters. The cards are in the graveyard by the time the creature enters the battlefield