opponent can not cast spells but you can

Activated abilities of creatures cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

, : Counter target spell.

Enchant creature : Tap enchanted creature. : Untap enchanted creature.

Each player can't cast more than one spell each turn.

Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana.