Rotcrown Ghoul

When Rotcrown Ghoul dies, target player mills five cards.

Jace's Phantasm

Flying
Jace's Phantasm gets +4/+4 as long as an opponent has ten or more cards in their graveyard.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)
Invisible Stalker can't be blocked.

Whenever Selhoff Occultist or another creature dies, target player mills a card.

Tap target creature. It doesn't untap during its controller's next untap step.
Draw a card.

Target player mills X cards, where X is the number of lands you control.

Flying
{U}, {T}: You may tap or untap target creature.

Enchant artifact or creature
Enchanted permanent doesn't untap during its controller's untap step and its activated abilities can't be activated.

Look at the top five cards of your library, then put them back in any order.

Each player mills five cards.
Flashback {7}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Enchant player
At the beginning of enchanted player's upkeep, that player mills two cards.

Target player mills two cards.
Draw a card.

Counter target spell. Untap up to four lands.

Counter target creature spell. Create a 1/1 blue Spirit creature token with flying.

When Archaeomancer enters the battlefield, return target instant or sorcery card from your graveyard to your hand.

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.

As an additional cost to cast this spell, exile a creature card from your graveyard.

Whenever another blue creature enters the battlefield under your control, target player mills two cards.

{2}, {T}: You gain 5 life. Shuffle Elixir of Immortality and your graveyard into their owner's library.

Whenever Crosstown Courier deals combat damage to a player, that player mills that many cards.