Tess, Firefly Finder

When Tess, Firefly Finder enters the battlefield,
you may search your library and/or graveyard for
a card with the word "Firefly" in its name, ability,
or quote text. If you do, reveal it and put it into
your hand.
{4},{t}: Target creature gains shadow until end of
turn. Whenever you activate this ability,
Proliferate.
I can buy you some time but you have to run...