Debtors' Knell

({W/B} can be paid with either {W} or {B}.)
At the beginning of your upkeep, put target creature card from a graveyard onto the battlefield under your control.

Djinn Illuminatus

({U/R} can be paid with either {U} or {R}.)
Flying
Each instant and sorcery spell you cast has replicate. The replicate cost is equal to its mana cost. (When you cast it, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Giant Solifuge

({R/G} can be paid with either {R} or {G}.)
Trample; haste; shroud (This creature can't be the target of spells or abilities.)

Gruul Guildmage

({R/G} can be paid with either {R} or {G}.)
{3}{R}, Sacrifice a land: This creature deals 2 damage to target player or planeswalker.
{3}{G}: Target creature gets +2/+2 until end of turn.

Izzet Guildmage

({U/R} can be paid with either {U} or {R}.)
{2}{U}: Copy target instant spell you control with mana value 2 or less. You may choose new targets for the copy.
{2}{R}: Copy target sorcery spell you control with mana value 2 or less. You may choose new targets for the copy.

Mourning Thrull

({W/B} can be paid with either {W} or {B}.)
Flying
Whenever this creature deals damage, you gain that much life.

Orzhov Guildmage

{2}{W}: Target player gains 1 life.
{2}{B}: Each player loses 1 life.

Petrahydrox

({U/R} can be paid with either {U} or {R}.)
When this creature becomes the target of a spell or ability, return this creature to its owner's hand.

Wild Cantor

({R/G} can be paid with either {R} or {G}.)
Sacrifice this creature: Add one mana of any color.

Shrieking Grotesque

Flying
When this creature enters, if {B} was spent to cast it, target player discards a card.

Gruul Signet

Gruul War Plow

Creatures you control have trample.
{1}{R}{G}: This artifact becomes a 4/4 Juggernaut artifact creature until end of turn.

Izzet Signet

Mizzium Transreliquat

{3}: This artifact becomes a copy of target artifact until end of turn.
{1}{U}{R}: This artifact becomes a copy of target artifact, except it has this ability.

Moratorium Stone

{2}, {T}: Exile target card from a graveyard.
{2}{W}{B}, {T}, Sacrifice this artifact: Exile target nonland card from a graveyard, all other cards from graveyards with the same name as that card, and all permanents with that name.

Guildpact