MTG

Until end of turn, target creature gets +1/+0 and gains first strike and lifelink.

Izzet Guildgate enters the battlefield tapped. {T}: Add {U} or {R}.

Rakdos Guildgate enters the battlefield tapped. {T}: Add {B} or {R}.

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

Flying

{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.

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 {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 ...

{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.

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

Whenever Street Sweeper attacks, destroy all Auras attached to target land.

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

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

{T}: Add {C}. {3}{G}{W}, {T}, Tap two untapped creatures you control, Sacrifice Grove of the Guardian: Create an 8/8 green and white Elemental crea...

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

When Seller of Songbirds enters the battlefield, create a 1/1 white Bird creature token with flying.

Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)

Haste

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...

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

Flying

{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.

Equipped creature gets +1/+0 for each of its colors. Equip {1}

{T}: Target player puts the top card of their library into their graveyard. {5}, {T}, Sacrifice Codex Shredder: Return target card from your gravey...