Didn't Say Please

Counter target spell. Its controller mills three cards.

Revoke Existence

Essence Scatter

Miscast

Counter target instant or sorcery spell unless its controller pays {3}.

Cleansing Nova

Choose one —
• Destroy all creatures.
• Destroy all artifacts and enchantments.

Plains

Island

Neutralize

Counter target spell.
Cycling {2} ({2}, Discard this card: Draw a card.)

Skyclave Apparition

When Skyclave Apparition enters, exile up to one target nonland, nontoken permanent you don't control with mana value 4 or less.
When Skyclave Apparition leaves the battlefield, the exiled card's owner creates an X/X blue Illusion creature token, where X is the mana value of the exiled card.

Shatter the Sky

Each player who controls a creature with power 4 or greater draws a card. Then destroy all creatures.

Tranquil Cove

This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {W} or {U}.

Mystical Dispute

This spell costs {2} less to cast if it targets a blue spell.
Counter target spell unless its controller pays {3}.

Voracious Greatshark

Flash (You may cast this spell any time you could cast an instant.)
When this creature enters, counter target artifact or creature spell.

Rewind

Counter target spell. Untap up to four lands.

Cast Off

Destroy all non-Giant creatures. (Then exile this card. You may cast the creature later from exile.)