Cryptic Serpent

This spell costs {1} less to cast for each instant and sorcery card in your graveyard.

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Deem Inferior

This spell costs {1} less to cast for each card you've drawn this turn.
The owner of target nonland permanent puts it into their library second from the top or on the bottom.

Spell Pierce

Counter target noncreature spell unless its controller pays {2}.

Deep Analysis

Target player draws two cards.
Flashback—{1}{U}, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Boomerang

Return target permanent to its owner's hand.

Counterspell

Lórien Revealed

Draw three cards.
Islandcycling {1} ({1}, Discard this card: Search your library for an Island card, reveal it, put it into your hand, then shuffle.)

Insectile Aberration

Delver of Secrets

At the beginning of your upkeep, look at the top card of your library. You may reveal that card. If an instant or sorcery card is revealed this way, transform Delver of Secrets.

Delver of Secrets // Insectile Aberration

Island

Mental Note

Thought Scour

Target player mills two cards.
Draw a card.

Tolarian Terror

This spell costs {1} less to cast for each instant and sorcery card in your graveyard.
Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)

Snap

Return target creature to its owner's hand. Untap up to two lands.

Echoing Truth

Return target nonland permanent and all other permanents with the same name as that permanent to their owners' hands.