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The state-of-the-art X-ray observatories emphkeyOpen XMM-NewtonkeyClose comma emphkeyOpen ChandrakeyClose and emphkeyOpen SwiftkeyClose have been actively collecting soft X-ray imaging data for more than a decade. We are launching a Live Search for x-ray Treasures openParLiSTclosePar project comma aiming to search for objects of important science value serendipitously detected by these observatories as soon as new data become public. We request a 24 ks emphkeyOpen XMM-NewtonkeyClose ToO observation to a very important X-ray object comma such as tidal disruption events and off-nuclear hyperluminous X-ray sources comma that we might discover during emphkeyOpen XMM-NewtonkeyClose AO18 from our LiST project in order to constrain their long-term variability and understand their nature.