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{2}{U}, {T}: Target creature gets -2/-0 until end of turn.

Exile target creature, then populate. (Create a token that's a copy of a creature token you control.)

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

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

Flying

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

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

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

{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...

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....

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

{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.

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.

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

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

{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.

Flying

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

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.)

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