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Creatures can't attack you or planeswalkers you control unless their controller pays {X} for each of those creatures, where X is the number of ench...

Golgari Guildgate enters the battlefield tapped. {T}: Add {B} or {G}.

({T}: Add {B} or {R}.) As Blood Crypt enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

Azorius Guildgate enters the battlefield tapped. {T}: Add {W} or {U}.

Trample Volatile Rig attacks each combat if able. Whenever Volatile Rig is dealt damage, flip a coin. If you lose the flip, sacrifice Volatile Rig....

As Tablet of the Guilds enters the battlefield, choose two colors. Whenever you cast a spell, if it's at least one of the chosen colors, you gain ...

{T}: Add {G} or {W}. {G}{W}: Selesnya Keyrune becomes a 3/3 green and white Wolf artifact creature until end of turn.

{T}: Add {B} or {R}. {B}{R}: Rakdos Keyrune becomes a 3/1 black and red Devil artifact creature with first strike until end of turn.

As Pithing Needle enters the battlefield, choose a card name. Activated abilities of sources with the chosen name can't be activated unless they'r...

{T}: Add {U} or {R}. {U}{R}: Until end of turn, Izzet Keyrune becomes a 2/1 blue and red Elemental artifact creature. Whenever Izzet Keyrune deals ...

Enchant nonland permanent At the beginning of the upkeep of enchanted permanent's controller, that player sacrifices it unless they pay {X}, where...

{T}: Add {B} or {G}. {B}{G}: Golgari Keyrune becomes a 2/2 black and green Insect artifact creature with deathtouch until end of turn.

Lands you control have "{T}: Add one mana of any color." {T}: Add one mana of any color.

{T}: Add {W} or {U}. {W}{U}: Azorius Keyrune becomes a 2/2 white and blue Bird artifact creature with flying until end of turn.

Destroy target artifact or enchantment, then populate. (Create a token that's a copy of a creature token you control.)

Scavenge {0} ({0}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only...

Haste

Exile an instant or sorcery spell you control: Put two +1/+1 counters on Nivmagus Elemental. (That spell won't resolve.)

Flying Sacrifice Judge's Familiar: Counter target instant or sorcery spell unless its controller pays {1}.

At the beginning of your upkeep, populate. (Create a token that's a copy of a creature token you control.)

{U/R}: Frostburn Weird gets +1/-1 until end of turn.

If an instant or sorcery card would be put into a graveyard from anywhere, exile it instead.

{T}: Exile target land card from a graveyard. Add one mana of any color. {B}, {T}: Exile target instant or sorcery card from a graveyard. Each oppo...