Knights' Charge is a rare Enchantment card from March of the Machine Commander (MOC), collector number 333. Current market price: $1.13, TCGplayer market prices via Scryfall.
Whenever a Knight you control attacks, each opponent loses 1 life and you gain 1 life. {6}{W}{B}, Sacrifice this enchantment: Return all Knight creature cards from your graveyard to the battlefield.