Moat

Enchantment, 2WW (4)
Creatures without flying can't attack.¹
The purpose of any moat is to impede attack. Some are filled with water, some with thistles. Some are filled with things best left unseen.
Illus. Jeff A. Menges

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (1/2)	Legends (Rare)