Fraying Sanity | Enchantment | Aura Curse | Enchant player
At the beginning of each end step, enchanted player mills X cards, where X is the number of cards put into their graveyard from anywhere this turn. | Ryan Alexander Lee
Riddleform | Enchantment | | Whenever you cast a noncreature spell, you may have Riddleform become a 3/3 Sphinx creature with flying in addition to its other types until end of turn.
{2}{U}: Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.) | Steve Argyle
Swarm Intelligence | Enchantment | | Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy. | Daniel Ljunggren
Unquenchable Thirst | Enchantment | Aura | Enchant creature
When Unquenchable Thirst enters the battlefield, if you control a Desert or there is a Desert card in your graveyard, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step. | Jeremy Wilson