Song of Stupefaction : The Lost Caverns of Ixalan

Type: Enchantment — Aura
Rarity: Common
Color: U
Number: 77
Finishes: nonfoil, foil
Reprint: No
Printings: LCI

Text: Enchant creature or Vehicle When Song of Stupefaction 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.
Variations:

Finish	Market Price	Lowest Price	Higest Price	Average Price
Normal	$0.03	$0.02	$0.03	$0.02
Foil	$0.03	$0.02	$0.02	$0.02

Legality

Alchemy		Brawl
Commander		Duel
Explorer		Gladiator
Historic		Legacy
Modern		Oathbreaker
Pauper		Pauper Commander
Penny		Pioneer
Standard		Timeless

Rulings

11/10/2023

Cards with the ability word "fathomless descent" have abilities that care how many permanent cards are in your graveyard.
11/10/2023

If you don't have at least two cards in your library, you can't choose to mill two cards.
11/10/2023

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.
11/10/2023

The value of X will change as the number of permanent cards in your graveyard changes.