Sylphrena

Shroud, Undying. Sylphrena can't attack or
block.
When Sylphrena enters the battlefield, remove
any number of -1/-1 counters from it. At the
beginning of your upkeep, each player draws
a card.
If a legendary creature you control would die this
turn, instead tap it and remove it from combat,
then transform Sylphrena.