Runnerís Bane 1U

Enchantment ó Aura
Enchant creature with power 3 or less
When Runnerís Bane enters the battlefield, tap enchanted creature.
Enchanted creature doesnít untap during its controllerís untap step.

If the enchanted creatureís power increases to 4 or greater, Runnerís Bane will be put into its ownerís graveyard as a state-based action.

The enchanted creature can still be untapped in other ways, such as by Aurelia, the Warleader.