Teila, Wielder of the Mask

You may have Teila, Weilder of the Mask enter
the battlefield as a copy of any creature on the battlefield except its name is Teila, Weilder of
the Mask, it's a blue legendary elf in addition to
its other types, and it has hexproof and
"{3}{u}{u}: This creature becomes a copy of any creature on the battlefield." If you don't, draw
two cards.
{1}{u}{u}: Return Teila to its owners hand.