Umezawa's Jitte is a rare Legendary Artifact — Equipment card from Secret Lair Drop (SLD), collector number 1288. Current market price: $17.22 (foil $14.93), TCGplayer market prices via Scryfall.
Whenever equipped creature deals combat damage, put two charge counters on Umezawa's Jitte. Remove a charge counter from Umezawa's Jitte: Choose one — • Equipped creature gets +2/+2 until end of turn. • Target creature gets -1/-1 until end of turn. • You gain 2 life. Equip {2}