Jace's Archivist

{U}, {T}: Each player discards their hand, then draws cards equal to the greatest number of cards a player discarded this way.

Hedron Crab

Landfall — Whenever a land you control enters, target player mills three cards.

Defender
Whenever Wall of Frost blocks a creature, that creature doesn't untap during its controller's next untap step.

Target player mills half their library, rounded down.

Whenever Fleet Swallower attacks, target player mills half their library, rounded up.

At the beginning of each player's upkeep, that player mills X cards, where X is the number of cards in their hand.

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