Serine, Lady of Contracts

Haste
When Serine, Lady of Contracts enters the battlefield, you may give control of any number
of your permanents to target players.
{t}: Target opponent that controls a
permanent that you own: you gain colorless mana
equal to the converted mana cost of the given permanents or gain control of a permanent
with a converted mana cost of equal to or less than
the value of given permanent