Tuvasa the Sunlit — ruling 1

Tuvasa's triggered ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.

Tuvasa the Sunlit — ruling 2

Because damage remains marked on a creature until it's removed as the turn ends, nonlethal damage dealt to Tuvasa may become lethal if some of your enchantments leave the battlefield during that turn.

Tuvasa the Sunlit : règles, fonctionnement et interactions (MTG)

Tuvasa the Sunlit is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Tuvasa gets +1/+1 for each enchantment you control. Whenever you cast your first enchantment spell each turn, draw a card.

How it works : Tuvasa the Sunlit

Original English text — Wizards of the Coast / Scryfall

#1July 13, 2018· Wizards of the Coast
Tuvasa's triggered ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
No other card is named in this ruling.
#2July 13, 2018· Wizards of the Coast
Because damage remains marked on a creature until it's removed as the turn ends, nonlethal damage dealt to Tuvasa may become lethal if some of your enchantments leave the battlefield during that turn.
No other card is named in this ruling.