Atra Nube the Indecisive

Phasing (at the beginning of your upkeep, pay {b} to phase out when it's phased in or {w} to
phase in when it's phased out)
If a opponent controls a creature with flying
and a toughness of 1, Atra Nube gains flying
until end of turn and must attack if able.
{w/b}: Atra Nube gains flying until end of turn.
"Goddammit make a decision, I don't have all
day to hold open the dimensional portal"
—Zur the Enchanter