Doofus, Marker of Territories

First Strike, Indestructible, Menace, Defender
When Doofus, Marker of Territories enters the
battlefield, put a " Marked" counter on each of
up to 3 target lands you don't control.
As long as you control Doofus, Marker of
Territories, you may, on your turn, {t}
lands that have a Marked counter on them to
add 1 {c} to your mana pool. Those lands only
untap during their original owners untap step.