You may play an additional land on each of your turns.
{X}{B}{B}
Exsanguinate
Sorcery
Each opponent loses X life. You gain life equal to the life lost this way.
{2}
Jet Medallion
Artifact
Black spells you cast cost {1} less to cast.
{4}{G}{G}
Multani, Yavimaya's Avatar
Legendary Creature - Elemental Avatar
Reach, trample
Multani, Yavimaya's Avatar gets +1/+1 for each land you control and each land card in your graveyard.
{1}{G}, Return two lands you control to their owner's hand: Return Multani from your graveyard to your hand.
0 /
0
{3}{B}{B}
Ob Nixilis, the Fallen
Legendary Creature - Demon
Landfall -- Whenever a land enters the battlefield under your control, you may have target player lose 3 life. If you do, put three +1/+1 counters on Ob Nixilis, the Fallen.
3 /
3
{1}{B}{G}
Pernicious Deed
Enchantment
{X}, Sacrifice Pernicious Deed: Destroy each artifact, creature, and enchantment with mana value X or less.
{B}{B}{B}{B}
Phyrexian Obliterator
Creature - Phyrexian Horror
Trample
Whenever a source deals damage to Phyrexian Obliterator, that source's controller sacrifices that many permanents.
5 /
5
{G}
Sylvan Safekeeper
Creature - Human Wizard
Sacrifice a land: Target creature you control gains shroud until end of turn. (It can't be the target of spells or abilities.)
1 /
1
{3}{G}{G}
Titania, Protector of Argoth
Legendary Creature - Elemental
When Titania, Protector of Argoth enters the battlefield, return target land card from your graveyard to the battlefield.
Whenever a land you control is put into a graveyard from the battlefield, create a 5/3 green Elemental creature token.
5 /
3
--
Tranquil Thicket
Land
Tranquil Thicket enters the battlefield tapped.
{T}: Add {G}.
Cycling {G} ({G}, Discard this card: Draw a card.)
--
Underground River
Land
{T}: Add {C}.
{T}: Add {U} or {B}. Underground River deals 1 damage to you.
{2}{G}
Wayward Swordtooth
Creature - Dinosaur
Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)
You may play an additional land on each of your turns.
Wayward Swordtooth can't attack or block unless you have the city's blessing.