Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power.
{1}
Altar of the Brood
Artifact
Whenever another permanent enters the battlefield under your control, each opponent mills a card.
{3}
Bontu's Monument
Legendary Artifact
Black creature spells you cast cost {1} less to cast.
Whenever you cast a creature spell, each opponent loses 1 life and you gain 1 life.
{3}
Cloud Key
Artifact
As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost {1} less to cast.
{3}
Herald's Horn
Artifact
As Herald's Horn enters the battlefield, choose a creature type.
Creature spells you cast of the chosen type cost {1} less to cast.
At the beginning of your upkeep, look at the top card of your library. If it's a creature card of the chosen type, you may reveal it and put it into your hand.
{2}
Jet Medallion
Artifact
Black spells you cast cost {1} less to cast.
{3}{B}{B}
Marrow-Gnawer
Legendary Creature - Rat Rogue
All Rats have fear.
{T}, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.
2 /
3
{1}{B}
Rat Colony
Creature - Rat
Rat Colony gets +1/+0 for each other Rat you control.
A deck can have any number of cards named Rat Colony.
2 /
1
{3}
Semblance Anvil
Artifact
Imprint -- When Semblance Anvil enters the battlefield, you may exile a nonland card from your hand.
Spells you cast that share a card type with the exiled card cost {2} less to cast.
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
--
Swarmyard
Land
{T}: Add {C}.
{T}: Regenerate target Insect, Rat, Spider, or Squirrel. (The next time it would be destroyed, instead tap it, remove it from combat, and heal all damage on it.)
{2}
Thornbite Staff
Tribal Artifact - Shaman Equipment
Equipped creature has "{2}, {T}: This creature deals 1 damage to any target" and "Whenever a creature dies, untap this creature."
Whenever a Shaman creature enters the battlefield, you may attach Thornbite Staff to it.
Equip {4}
{3}
Urza's Incubator
Artifact
As Urza's Incubator enters the battlefield, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.