Solemnity | Enchantment | | Players can't get counters.
Counters can't be put on artifacts, creatures, enchantments, or lands. | Greg Opalinski
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
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
Imminent Doom | Enchantment | | Imminent Doom enters the battlefield with a doom counter on it.
Whenever you cast a spell with mana value equal to the number of doom counters on Imminent Doom, Imminent Doom deals that much damage to any target. Then put a doom counter on Imminent Doom. | Daniel Ljunggren