Herald of Leshrac
Creature - Avatar
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.)
Herald of Leshrac gets +1/+1 for each land you control but don't own.
When Herald of Leshrac leaves the battlefield, each player gains control of each land they own that you control.
legal Legacy
legal Vintage
legal Modern
not legal Standard
not legal Pioneer
not legal Pauper
not legal Historic
legal Commander