
Courier's Briefcase | Artifact | Treasure | When Courier's Briefcase enters, create a 1/1 green and white Citizen creature token.
{T}, Sacrifice Courier's Briefcase: Add one mana of any color.
{W}{U}{B}{R}{G}, {T}, Sacrifice Courier's Briefcase: Draw three cards. | Josu Hernaiz

Lyev Skyknight | Creature | Human Knight | Flying
When Lyev Skyknight enters, detain target nonland permanent an opponent controls. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.) | Johannes Voss

Azorius Guildgate | Land | Gate | This land enters tapped.
{T}: Add {W} or {U}. | Drew Baker