Angelic Wall

Defender (This creature can't attack.)
Flying

Thought Scour

Target player mills two cards.
Draw a card.

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.

Target player mills half their library, rounded down.

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

When Homarid Explorer enters, target player mills four cards.

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

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

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

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

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

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

Enchant creature
Enchanted creature can't attack or block.

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