Damia, Sage of Stone

• WOTC Official Reminder Textofficial rules
  Deathtouch — Any amount of damage this deals to a creature is enough to destroy it.

• WWizards of the Coast2011-09-22
  Official Ruling
  The number of cards in your hand is checked at the beginning of your upkeep before you have the opportunity to cast spells and activate abilities. If you have seven or more cards in your hand at that time, Damia’s last ability won’t trigger.
• WWizards of the Coast2011-09-22
  Official Ruling
  Effects can modify the number of cards you’ll draw. For example, if you have four cards in your hand and control Thought Reflection (“If you would draw a card, draw two cards instead.”), you’ll draw six cards.
• WWizards of the Coast2011-09-22
  Official Ruling
  When Damia’s triggered ability tries to resolve, if you have seven or more cards in your hand, it will have no effect. If you have fewer than seven cards in your hand, you’ll determine the difference and draw that many cards.
• WWizards of the Coast2011-09-22
  Official Ruling
  After the ability has triggered but before it resolves, you have the opportunity to cast spells and activate abilities.

Rulings via Scryfall