Detective Needles

Partner with Edith, Friend-to-All. (When this
creature enters the battlefield, target player may put
Edith, Friend-to-All into their hand from their library,
then shuffle.)
Prowl {r/w}{w/u} (You may cast this card for its Prowl cost
if you dealt combat damage to a player this turn with
a Gnome.)
When Detective Needles enters the battlefield, Investigate 1. If you paid Detective Needles'
Prowl cost, then it gains the following ability:
-{t}; Investigate 1.