Leyline of Combustion

If this card is in your opening hand, you may begin the game with it on the battlefield.
Whenever you and/or at least one permanent you control becomes the target of a spell or ability an opponent controls, this enchantment deals 2 damage to that player.

Core Set 2020

If Leyline of Combustion is in your opening hand, you may begin the game with it on the battlefield.
Whenever you and/or at least one permanent you control becomes the target of a spell or ability an opponent controls, Leyline of Combustion deals 2 damage to that player.

Core Set 2020 Promos

If a spell targets you and/or a permanent you control multiple times, or if a spell targets you and one or more permanents you control, Leyline of Combustion's triggered ability triggers once.

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

A player's "opening hand" is the hand of cards the player has after all players have taken mulligans. If players have any cards in hand that allow actions to be taken with them from a player's opening hand, the starting player takes all such actions first in any order, followed by each other player in turn order. Then the first turn begins.