The number of strikes of one Nazgul hazard creature is increased by one and its prowess is decreased by 2. Attacker chooses defending characters. Additionally, target Nazgul may be played keyed to a Shadow-land or Shadow-hold . Cannot be duplicated on a given Nazgul.

(...) Alternatively, allows a Nazgul to be played keyed to a Shadow-land

I jak mogę zagrać tę kartę na nazgula,którego mam na ręku?

This card can be played and resolved before any Nazgûl is played with it. A Nazgûl must be played as the first declared action in the chain of effects following the resolution of Fell Beast, or else this card is returned to its player's hand. This card can be played on an existing Nazgûl attack, but the extra playability this card provides would not apply.

(...)This card can be played on an existing Nazgûl attack, but the extra playability this card provides would not apply.

Aha i jeszcze jedno pytanie. Skoro nazgul musi być pierwszą zadeklarowaną akcją to nie mogę połączyć działania Out of the Black Sky z Fell Beast? Bo kolejność musiałaby być taka Fell Beast + Out of the Black Sky + Nazgul.