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 C 
Creature – Merfolk Scout
When Merchant's Urchin enters the battlefield, draw a card then discard a card.
0/2
 C 
Creature – Merfolk Scout
Rhythm (Whenever you cast a spell, you may untap this creature.)
1/1
 C 
Creature – Human Spellshaper
{u}, {t}, Discard a card: Target creature is unblockable this turn.
2/1
 C 
Creature – Bird
Flying
{t}: Target land becomes the basic land type of your choice until end of turn.
1/1
 C 
Creature – Bird
Flying
Sacrifice Spiketail Hawk: Counter target spell unless its controller pays {1}.
2/2
 C 
Creature – Elemental Beast
Rhythm (Whenever you cast a spell, you may untap this creature.)
Whenever Tremulous Aquamoeba becomes untapped, you may switch its power and toughness until end of turn.
1/4
 C 
Creature – Bird Scout
Flash
Flying
When Aven Retriever enters the battlefield, you may return a creature you control to its owner's hand.
3/2
 C 
Creature – Vedalken Soldier
2/5
 C 
Creature – Merfolk Wizard
Islandwalk
When Spiralseer enters the battlefield, shuffle your graveyard into your library, then draw a card.
3/3
 C 
Sorcery
Look at target opponent's hand, then look at the top five cards of your library and put them back in any order.
 C 
Instant
Choose one — Draw a card, then discard a card; or switch target creature's power and toughness until end of turn; or target player puts the top five cards of his or her library on the bottom of their library.
 C 
Enchantment – Aura
Enchant creature
Enchanted creature has rhythm. (Whenever you cast a spell, you may untap this creature.)
Enchanted creature doesn't untap during its controller's untap step.
 C 
Instant
Untap up to three target attacking creatures and remove them from combat.
 C 
Instant
Counter target spell unless its controller pays {2} for each spell they've cast this turn.
Melody — If you’ve cast another spell this turn, draw a card.
"Nice tune; let me see what I can do with it."
 C 
Sorcery
Draw two cards.
Melody — If you've cast another spell this turn, draw three cards instead.
 C 
Instant
Choose one — Counter target noncreature spell; or return target creature an opponent controls to its owner's hand.
"I care not what you think you've done, but rather what you think you're planning."
— Humair Jeet, Themestrian Inspector
 C 
Sorcery
Each player puts the top ten cards of his or her library into his or her graveyard.
 C 
Instant
Delve (You may exile any number of cards in your graveyard as you cast this spell. It costs {1} less to cast for each card exiled this way.)
Return target permanent to its owner's hand.