Grim Strider — ruling 1

If a spell or ability causes you to draw cards and then has you remove some from hand (such as by discarding them or putting them on top of your library), Grim Strider may briefly have 0 toughness or less. As long as its toughness is 1 or greater again after the spell or ability is finished resolving, it will remain on the battlefield.

Grim Strider — ruling 2

Because damage remains marked on a creature until it’s removed as the turn ends, the damage a Grim Strider takes during combat may become lethal if you draw cards later in the turn.

Grim Strider : règles, fonctionnement et interactions (MTG)

Grim Strider 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

This creature gets -1/-1 for each card in your hand.

How it works : Grim Strider

Original English text — Wizards of the Coast / Scryfall

#1April 18, 2017· Wizards of the Coast
If a spell or ability causes you to draw cards and then has you remove some from hand (such as by discarding them or putting them on top of your library), Grim Strider may briefly have 0 toughness or less. As long as its toughness is 1 or greater again after the spell or ability is finished resolving, it will remain on the battlefield.
No other card is named in this ruling.
#2April 18, 2017· Wizards of the Coast
Because damage remains marked on a creature until it’s removed as the turn ends, the damage a Grim Strider takes during combat may become lethal if you draw cards later in the turn.
No other card is named in this ruling.