Leovold, Emissary of Trest — ruling 1

Your opponents can draw a maximum of one card each on each player’s turn. Subsequent card draws during that turn are ignored.

Leovold, Emissary of Trest — ruling 2

If an opponent hasn’t drawn any cards in a turn and a spell or ability instructs that player to draw multiple cards, that player will just draw one card. However, if the draws are optional, the player can’t choose to draw, even if they could draw one card this way.

Leovold, Emissary of Trest — ruling 3

Leovold will “see” cards drawn by opponents earlier in the turn before it entered the battlefield, although Leovold can’t affect cards drawn before it entered the battlefield. For example, if an opponent draws two cards, then Leovold enters the battlefield, that opponent can’t draw more cards that turn, but the two drawn cards are unaffected.

Leovold, Emissary of Trest — ruling 4

Replacement effects (such as that of dredge or Laboratory Maniac’s ability) can’t be used to replace draws that Leovold disallows. However, if an opponent’s first draw is replaced (by a dredge ability, for example), that draw didn’t happen and Leovold won’t stop the next draw.

Leovold, Emissary of Trest — ruling 5

If you and a permanent you control each become the target of the same spell or ability an opponent controls, Leovold’s ability will trigger twice. The same is true if two permanents you control become the target of the same spell or ability an opponent controls.

Leovold, Emissary of Trest : règles, fonctionnement et interactions (MTG)

Leovold, Emissary of Trest 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

Each opponent can't draw more than one card each turn. Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, you may draw a card.

How it works : Leovold, Emissary of Trest

Original English text — Wizards of the Coast / Scryfall

#1December 7, 2018· Wizards of the Coast
Your opponents can draw a maximum of one card each on each player’s turn. Subsequent card draws during that turn are ignored.
No other card is named in this ruling.
#2December 7, 2018· Wizards of the Coast
If an opponent hasn’t drawn any cards in a turn and a spell or ability instructs that player to draw multiple cards, that player will just draw one card. However, if the draws are optional, the player can’t choose to draw, even if they could draw one card this way.
No other card is named in this ruling.
#3December 7, 2018· Wizards of the Coast
Leovold will “see” cards drawn by opponents earlier in the turn before it entered the battlefield, although Leovold can’t affect cards drawn before it entered the battlefield. For example, if an opponent draws two cards, then Leovold enters the battlefield, that opponent can’t draw more cards that turn, but the two drawn cards are unaffected.
No other card is named in this ruling.
#4December 7, 2018· Wizards of the Coast
Replacement effects (such as that of dredge or Laboratory Maniac’s ability) can’t be used to replace draws that Leovold disallows. However, if an opponent’s first draw is replaced (by a dredge ability, for example), that draw didn’t happen and Leovold won’t stop the next draw.
No other card is named in this ruling.
#5December 7, 2018· Wizards of the Coast
If you and a permanent you control each become the target of the same spell or ability an opponent controls, Leovold’s ability will trigger twice. The same is true if two permanents you control become the target of the same spell or ability an opponent controls.
No other card is named in this ruling.