Agent's Toolkit — ruling 1

The shield counter on Agent's Toolkit won't prevent its controller from sacrificing it.

Agent's Toolkit — ruling 2

If Agent's Toolkit somehow ends up with counters on it other than the ones it entered with, those may also be moved from it by its triggered ability.

Agent's Toolkit — ruling 3

Shield counters don't prevent players from sacrificing creatures.

Agent's Toolkit — ruling 4

Removing a shield counter in this way isn't the same as regenerating a creature.

Agent's Toolkit — ruling 5

If a permanent that would be dealt damage has more than one shield counter on it, that damage is prevented and only one shield counter is removed.

Agent's Toolkit — ruling 6

If a permanent with a shield counter is dealt unpreventable damage, that damage will be dealt and a shield counter will still be removed.

Agent's Toolkit — ruling 7

A creature with a shield counter on it may still be destroyed by state-based actions if it has damage marked on it equal to its toughness or has been dealt unpreventable damage by a source with deathtouch.

Agent's Toolkit — ruling 8

“Shield” is not an ability that creatures have and shield counters are not keyword counters. If a creature with a shield counter loses its abilities, the shield counter will still protect it as normal.

Agent's Toolkit : règles, fonctionnement et interactions (MTG)

Agent's Toolkit 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 artifact enters with a +1/+1 counter, a flying counter, a deathtouch counter, and a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.) Whenever a creature you control enters, you may move a counter from this artifact onto that creature. , Sacrifice this artifact: Draw a card.

How it works : Agent's Toolkit

Original English text — Wizards of the Coast / Scryfall

#1April 29, 2022· Wizards of the Coast
The shield counter on Agent's Toolkit won't prevent its controller from sacrificing it.
No other card is named in this ruling.
#2April 29, 2022· Wizards of the Coast
If Agent's Toolkit somehow ends up with counters on it other than the ones it entered with, those may also be moved from it by its triggered ability.
No other card is named in this ruling.
#3April 29, 2022· Wizards of the Coast
Shield counters don't prevent players from sacrificing creatures.
No other card is named in this ruling.
#4April 29, 2022· Wizards of the Coast
Removing a shield counter in this way isn't the same as regenerating a creature.
No other card is named in this ruling.
#5April 29, 2022· Wizards of the Coast
If a permanent that would be dealt damage has more than one shield counter on it, that damage is prevented and only one shield counter is removed.
No other card is named in this ruling.
#6April 29, 2022· Wizards of the Coast
If a permanent with a shield counter is dealt unpreventable damage, that damage will be dealt and a shield counter will still be removed.
No other card is named in this ruling.
#7April 29, 2022· Wizards of the Coast
A creature with a shield counter on it may still be destroyed by state-based actions if it has damage marked on it equal to its toughness or has been dealt unpreventable damage by a source with deathtouch.
No other card is named in this ruling.
#8April 29, 2022· Wizards of the Coast
“Shield” is not an ability that creatures have and shield counters are not keyword counters. If a creature with a shield counter loses its abilities, the shield counter will still protect it as normal.
No other card is named in this ruling.