Black Lotus

{T}, Sacrifice Black Lotus: Add three mana of any one color.

Conservator

{3}, {T}: Prevent the next 2 damage that would be dealt to you this turn.

Clockwork Beast

Clockwork Beast enters with seven +1/+0 counters on it.
At end of combat, if Clockwork Beast attacked or blocked this combat, remove a +1/+0 counter from it.
{X}, {T}: Put up to X +1/+0 counters on Clockwork Beast. This ability can't cause the total number of +1/+0 counters on Clockwork Beast to be greater than seven. Activate only during your upkeep.

Forcefield

{1}: The next time an unblocked creature of your choice would deal combat damage to you this turn, prevent all but 1 of that damage.

Kormus Bell

All Swamps are 1/1 black creatures that are still lands.

Disrupting Scepter

{3}, {T}: Target player discards a card. Activate only during your turn.

Time Vault

Time Vault enters tapped.
Time Vault doesn't untap during your untap step.
If you would begin your turn while Time Vault is tapped, you may skip that turn instead. If you do, untap Time Vault.
{T}: Take an extra turn after this one.

Howling Mine

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.