Unwilling Conscription

Kicker {1}{u}{u} (you may pay an additional
{1}{u}{u} to cast this spell.)
Enchant creature with mana value 4 or less.
You control enchanted creature. At the
beginning of combat on your turn untap it, and
it gains haste until end of turn.
Sacrifice this enchantment at the beginning of
your endstep unless it was kicked.