Omun-sen Fortress

"Omun-sen Fortress" enter the battlefield tap.
{t} : give one mana of any color you want
{t}{x}{r}{u} : Omun-Sen Fortress become a 0/X creature land with defender, "this creature can
block multiple time" and "when the attacker
choose the damage order on blockers Omun-Sen Fortress has to be first" until the end of the turn.