Herald of Leshrac is a rare Creature — Avatar card from The List (PLST), collector number CSP-62. Current market price: — (foil $3.99), TCGplayer market prices via Scryfall.
Flying Cumulative upkeep—Gain control of a land you don't control. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) This creature gets +1/+1 for each land you control but don't own. When this creature leaves the battlefield, each player gains control of each land they own that you control.