Homarid Explorer

When Homarid Explorer enters, target player mills four cards.

Shriekgeist

Flying
Whenever Shriekgeist deals combat damage to a player, that player mills two cards.

Defender (This creature can't attack.)
Flying

Target player mills half their library, rounded down.

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

Enchant creature
Enchanted creature can't attack or block.

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

Defender
{2}: Amaranthine Wall gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

At the beginning of your upkeep, target opponent mills three cards, then you draw a card for each land card put into their graveyard this way.

Whenever you cast a blue spell, target player mills two cards.

Defender
When Mnemonic Wall enters, you may return target instant or sorcery card from your graveyard to your hand.

Defender, flying
Prevent all combat damage that would be dealt to and dealt by Fog Bank.

Defender
{2}{U}, {T}: Target player mills X cards, where X is the number of creatures you control with defender.

Target player mills two cards.
Draw a card.

Meandering River enters tapped.
{T}: Add {W} or {U}.

({T}: Add {W} or {U}.)
As Hallowed Fountain enters, you may pay 2 life. If you don't, it enters tapped.