Ordina, Liturgical Town

Ordina, Liturgical Town enters the battlefield
tapped.
{t}: Add {w} or {u}.
{t}: Exile target creature you control with mana
value X or less, where X is the highest mana
value among enchantments you control until
Ordina leaves the battlefield. If a creature is put
into exile this way, return each other card exiled
with Ordina to the battlefield under its owner's
control.