Bewitching Leechcraft (The Lord of the Rings: Tales of Middle-earth #492)

Enchantment — Aura - {1}{U}
Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature has "If this creature would untap during your untap step, remove a +1/+1 counter from it instead. If you do, untap it." (Otherwise, it doesn't untap.)