What transition metal ions form without oxidant in water pH 7?
If you are counting lanthanides as "transition metals", then look at europium whose reactivity with water is similar to calcium.  Although the product listed in the reference is the trivalent hydroxide $\ce{Eu(OH)3}$, europium has a relativy stable +2 oxidation state and so the reaction msy proceed via a relatively soluble divalent hydroxide or cation ($\ce{Eu(OH)2, Eu^{2+}}$).  The combination of a highly electropositive element, possibly with formation of a relatively soluble, low oxidation state hydroxide/cation makes europium more reactive to water than most transition metals.