The control effect applies so long as at least one Aura is attached to the creature, and will continue to apply even if Rootwater Matriarch has left the battlefield. The effect ends if at any time the creature has no Auras on it.
15-07-2007
wotc
Unlike many similar creatures, Rootwater Matriarch untaps as normal during your untap step. Whether it’s tapped or untapped has no bearing on the control-change effect.
01-08-2005
wotc
A creature is “enchanted” if it has any Auras attached to it.
04-10-2004
wotc
Can target an unenchanted creature but has no effect on that creature.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.