Spell Blast

Counter target spell with mana value X. (For example, if that spell's mana cost is {3}{U}{U}, X is 5.)

City of Brass

Whenever this land becomes tapped, it deals 1 damage to you.
{T}: Add one mana of any color.

Island

Icy Manipulator

{1}, {T}: Tap target artifact, creature, or land.

Counterspell

Savannah Lions

Sol Ring

Braingeyser

Circle of Protection: Black

{1}: The next time a black source of your choice would deal damage to you this turn, prevent that damage.

Serendib Efreet

Flying
At the beginning of your upkeep, this creature deals 1 damage to you.

Balance

Each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest, then sacrifices the rest. Players discard cards and sacrifice creatures the same way.

Disenchant

Serra Angel

Flying
Vigilance (Attacking doesn't cause this creature to tap.)

Tundra

Jayemdae Tome

Psionic Blast

Psionic Blast deals 4 damage to any target and 2 damage to you.

Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Mishra's Factory

{T}: Add {C}.
{1}: This land becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
{T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Copy Artifact

You may have this enchantment enter as a copy of any artifact on the battlefield, except it's an enchantment in addition to its other types.

Blue Elemental Blast

Choose one —
• Counter target red spell.
• Destroy target red permanent.

Divine Offering

Destroy target artifact. You gain life equal to its mana value.

Plains

Island Sanctuary

If you would draw a card during your draw step, instead you may skip that draw. If you do, until your next turn, you can't be attacked except by creatures with flying and/or islandwalk.

Circle of Protection: Red

{1}: The next time a red source of your choice would deal damage to you this turn, prevent that damage.

Icatian Javelineers

This creature enters with a javelin counter on it.
{T}, Remove a javelin counter from this creature: It deals 1 damage to any target.

Wrath of God

Destroy all creatures. They can't be regenerated.

Mana Drain

Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.