Rat Warren

Rat Warren enters the battlefield tapped.
{t}: Exchange control and ownership of all lands you own in play with all lands Jason owns in
play. Rat Warren goes to its owner's graveyard
at the end of this turn. If Rat Warren does not currently have a sticker, cover Jason's name with
a sticker that has your name on it. If Rat Warren currently has a sticker covering Jason's name, remove that sticker.