Remembrance of the Doves

Creatures with Flying you control gain +1/+1.
{1}{w}{w}: Exile a creature card from your
graveyard. Create two 1/1 white Dove tokens
with "Flying, has the Bird type."
No living human knows for certain, but they say the
largest kingdom before the coming of the Baron was
symbolized by Doves. Or that perhaps the lost royal
line was. Mayhap Doves remember.