Sacred Mesa

At the beginning of your upkeep, sacrifice Sacred Mesa unless you sacrifice a Pegasus.
{1}{W}: Create a 1/1 white Pegasus creature token with flying.

Syphon Soul

Syphon Soul deals 2 damage to each other player. You gain life equal to the damage dealt this way.

Lesser Gargadon

Whenever Lesser Gargadon attacks or blocks, sacrifice a land.

Mawcor

Flying
{T}: Mawcor deals 1 damage to any target.

Killer Bees

Flying
{G}: Killer Bees gets +1/+1 until end of turn.

Infernal Contract

Draw four cards. You lose half your life, rounded up.

Merchant of Secrets

When Merchant of Secrets enters, draw a card.

Breeding Pit

At the beginning of your upkeep, sacrifice Breeding Pit unless you pay {B}{B}.
At the beginning of your end step, create a 0/1 black Thrull creature token.