Sachi, Dusk Connector

{1}{u/b}{b/g}{g/u}{t}: Tap target creature, and that creature cannot untap as long as this card on the field, and this card gains that card power,toughness and abilities but with this card ability remains
{3}{u}{b}{g}{ut}: this card becomes a copy of creature in graveyard with this card ability remains
Transform this card, activate this ability when you tapped 5 or more creature with this creature ability