Snowborn Naiad

Bestow {s}{s}{u} or {3}{u} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature.
It becomes a creature again if it's not attached to a creature.)
Freezing touch (Whenever this creature blocks or
becomes blocked by a creature, tap that creature. It
doesn't untap during its controller's next untap step.)
Enchanted creature gets +2/+2 and has freezing
touch.