Murmuring Mystic

Whenever you cast an instant or sorcery spell, create a 1/1 blue Bird Illusion creature token with flying.

Skred

Skred deals damage to target creature equal to the number of snow permanents you control.

Breath Weapon

Breath Weapon deals 2 damage to each non-Dragon creature.

Volatile Fjord

({T}: Add {U} or {R}.)
Volatile Fjord enters tapped.

Ash Barrens

{T}: Add {C}.
Basic landcycling {1} ({1}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

Brainstorm

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

Maestros Theater

When Maestros Theater enters, sacrifice it. When you do, search your library for a basic Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle and you gain 1 life.

Dispel

Spell Pierce

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

Crimson Fleet Commodore

Trample
When Crimson Fleet Commodore enters, you become the monarch.

Snow-Covered Mountain

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.)

Lose Focus

Replicate {U} (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)
Counter target spell unless its controller pays {2}.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Augur of Bolas

When Augur of Bolas enters, look at the top three cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Counterspell

Snow-Covered Island

Ponder

Look at the top three cards of your library, then put them back in any order. You may shuffle.
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}.)