Briella, the Shieldmaiden

Defender, vigilance

Other creatures you control with defender get
+0/+1 and have vigilance.

{1}{u}, {t}: Reveal the top card of card of your
library. If it's a creature card with defender, you
may cast that card. If you do, it costs {1} less to
cast. If you don't, put that card on the bottom of
your library.