Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Shapeshifter

As this creature enters, choose a number between 0 and 7.
At the beginning of your upkeep, you may choose a number between 0 and 7.
Shapeshifter's power is equal to the last chosen number and its toughness is equal to 7 minus that number.

Glasses of Urza

Maze of Ith

{T}: Untap target attacking creature. Prevent all combat damage that would be dealt to and dealt by that creature this turn.

City of Brass

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

Nevinyrral's Disk

This artifact enters tapped.
{1}, {T}: Destroy all artifacts, creatures, and enchantments.

Sol Ring

Meekstone

Creatures with power 3 or greater don't untap during their controllers' untap steps.

Mox Emerald

Strip Mine

{T}: Add {C}.
{T}, Sacrifice this land: Destroy target land.

Mox Sapphire

Jalum Tome

{2}, {T}: Draw a card, then discard a card.