MTG

({T}: Add {G} or {W}.) As Temple Garden enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

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

Selesnya Guildgate enters the battlefield tapped. {T}: Add {G} or {W}.

{T}: Add {C}. {4}, {T}: Target creature can't be blocked this turn.

{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.)

({T}: Add {B}.)

Reach, trample

Destroy target creature with flying. You gain 2 life.

Destroy target artifact you don't control. Overload {4}{R} (You may cast this spell for its overload cost. If you do, change its text by replacing...

Flying Whenever a Dragon you control attacks, create a 6/6 red Dragon creature token with flying.

Jarad, Golgari Lich Lord gets +1/+1 for each creature card in your graveyard. {1}{B}{G}, Sacrifice another creature: Each opponent loses life equa...

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.)