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{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...

Trample Cryptborn Horror enters the battlefield with X +1/+1 counters on it, where X is the total life lost by your opponents this turn.

Whenever you cast an instant or sorcery spell, Blistercoil Weird gets +1/+1 until end of turn. Untap it.

At the beginning of your upkeep, put a filibuster counter on Azor's Elocutors. Then if Azor's Elocutors has five or more filibuster counters on it,...

Wayfaring Temple's power and toughness are each equal to the number of creatures you control. Whenever Wayfaring Temple deals combat damage to a p...

[+1]: Until your next turn, whenever a creature deals combat damage to Vraska the Unseen, destroy that creature. [-3]: Destroy target nonland perm...

{4}{G}{W}: Create a 3/3 green Centaur creature token. {2}{G}{W}: Populate. (Create a token that's a copy of a creature token you control.)