Stupefying Touch

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Enchantment — Aura

Enchant creature When this Aura enters, draw a card. Enchanted creature's activated abilities can't be activated.

Just because your eyes are open doesn't mean you're awake.

Legalities

standardpioneermodernlegacyvintagepaupercommanderbrawl

Rulings (2)

2016-06-08 Unlike many similar abilities, Stupefying Touch's last ability stops mana abilities from being activated.
2016-06-08 Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text.