Showing the one card where the name is exactly “song of stupefaction” and the set is “lci”

Song of Stupefaction {1}{U}

Enchantment — Aura

Enchant creature or Vehicle

When this Aura enters, you may mill two cards. (You may put the top two cards of your library into your graveyard.)

Fathomless descent — Enchanted permanent gets -X/-0, where X is the number of permanent cards in your graveyard.

Illustrated by Ernanda Souza

en es fr de it pt ja 汉语 ⋮

Prints	USD	EUR	TIX
The Lost Caverns of Ixalan	$0.02	€0.07	0.03

If you don't have at least two cards in your library, you can't choose to mill two cards. (2023-11-10)
The value of X will change as the number of permanent cards in your graveyard changes. (2023-11-10)

Cards with the ability word "fathomless descent" have abilities that care how many permanent cards are in your graveyard. (2023-11-10)
Some descend triggered abilities include intervening "if" clauses (i.e. "if you have [four or eight] permanent cards in your graveyard" in the middle of the ability). Each of these abilities checks your graveyard at the moment it would trigger to see if it does. If you don't have the required number of permanent cards in your graveyard at that time, the ability doesn't trigger at all. If it does trigger, it will check again as it tries to resolve. If you don't have the required number of permanent cards in your graveyard at that time, the ability won't resolve and none of its effects will happen. (2023-11-10)