The value of X is calculated only once, as Morcant's Eyes's last ability resolves
While other players can stop you drawing from Esper Sentinel, more often than not, they won't want to wait an extra turn to play their spells, more or less ensuring the card at least replaces itself
If a spell, ability, or effect states that a player can do something only any time they could cast a sorcery or only as a sorcery, it means only that the player must have priority, it must be during the main phase of their turn, and the stack must be empty
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"Vernusylph of the Flourishing Hills" and "Spirit of the Fall Wind"), or popularly-benevolent heavenly/celestial deities (e.g