A card you OWN means a card you brought to the game.
A card you CONTROL is a card for which you are making the decisions.
An Effect you Control is an effect originating from a Card you control.
In most situations, if you played the card, you control the effect of the card. Therefore, when your Mana Worm attacks and damages an enemy, you trigger Sistaran Robes. Likewise, when your opponent pays mana during the upkeep for their creature due to your Minor Essence Drain, you trigger Sistaran Robes.
