Boros Guildgate enters the battlefield tapped.

: Add or to your mana pool.

Destroy target land. Search your library for a basic land card and put that card onto the battlefield tapped. Then shuffle your library.

U

Mizzium Mortars deals 4 damage to target creature you don't control.

Overload (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")

Exile target instant or sorcery card from your graveyard and target instant or sorcery card from an opponent's graveyard. Copy those cards. Cast the copies if able without paying their mana costs. Exile Spelltwine.

Transguild Promenade enters the battlefield tapped.

When Transguild Promenade enters the battlefield, sacrifice it unless you pay .

: Add one mana of any color to your mana pool.