Beseech the Queen is a uncommon Sorcery card from Planechase (HOP), collector number 19. Current market price: $8.56, TCGplayer market prices via Scryfall.
({2/B} can be paid with any two mana or with {B}. This card's mana value is 6.) Search your library for a card with mana value less than or equal to the number of lands you control, reveal it, put it into your hand, then shuffle.