Pit Spawn

First strike
At the beginning of your upkeep, sacrifice Pit Spawn unless you pay {B}{B}.
Whenever Pit Spawn deals damage to a creature, exile that creature.

Impulse

Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Sandbar Serpent

Cycling {2} ({2}, Discard this card: Draw a card.)

Catalog

Sift

Reanimate

Put target creature card from a graveyard onto the battlefield under your control. You lose life equal to its mana value.

Underground Sea

Animate Dead

Enchant creature card in a graveyard
When Animate Dead enters, if it's on the battlefield, it loses "enchant creature card in a graveyard" and gains "enchant creature put onto the battlefield with Animate Dead." Return enchanted creature card to the battlefield under your control and attach Animate Dead to it. When Animate Dead leaves the battlefield, that creature's controller sacrifices it.
Enchanted creature gets -1/-0.

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Tolarian Serpent

At the beginning of your upkeep, mill seven cards.

Exhume

Each player puts a creature card from their graveyard onto the battlefield.

Pendrell Drake

Flying
Cycling {2} ({2}, Discard this card: Draw a card.)

Merfolk Looter

Attunement

Return Attunement to its owner's hand: Draw three cards, then discard four cards.

Swamp

Island

Bazaar of Baghdad

{T}: Draw two cards, then discard three cards.

Reflecting Pool

{T}: Add one mana of any type that a land you control could produce.

Rootbreaker Wurm

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)