Teferi's Tutelage — ruling 1

You draw a card and discard a card all while the first ability is resolving. Nothing can happen between the two, and no player may choose to take actions. This means that the second ability is put onto the stack after you've finished resolving the first ability.

Teferi's Tutelage : règles, fonctionnement et interactions (MTG)

Teferi's Tutelage 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

When this enchantment enters, draw a card, then discard a card. Whenever you draw a card, target opponent mills two cards. (They put the top two cards of their library into their graveyard.)

How it works : Teferi's Tutelage

Original English text — Wizards of the Coast / Scryfall

#1June 23, 2020· Wizards of the Coast
You draw a card and discard a card all while the first ability is resolving. Nothing can happen between the two, and no player may choose to take actions. This means that the second ability is put onto the stack after you've finished resolving the first ability.
No other card is named in this ruling.