Essence Leak

Enchantment - Aura, U (1)
Enchant permanent
If enchanted permanent is red or green, it has "At the beginning of your upkeep, sacrifice this permanent unless you pay its mana cost."¹
"We define the boundaries of reality; they don't define us." -Teferi
Illus. Adam Rex

Crystal Keep Rulings Summaries

• It can enchant a permanent that is not red or green, but it doesn't do anything in that case. [Invasion FAQ 2000/10/03]
• Note - Also see Aura, Rule G1.30.
• Note - This card was of type "Enchant Permanent" until Oracle 2005/08/01.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (1/6)	Invasion (Uncommon)