Hydrogre

Bestow {2}{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.)
Whenever Hydrogre or enchanted creature blocks
or becomes blocked, tap each creature blocking it
or blocked by it. Those creatures don't untap on
their controller's next untap step.
Enchanted creature get +0/+3.