Leyline Axe
Artifact — Equipment
If this card is in your opening hand, you may begin the game with it on the battlefield.
Equipped creature gets +1/+1 and has double strike and trample.
Equip 
(: Attach to target creature you control. Equip only as a sorcery.)
It awaits a worthy wielder.
Edgar Sánchez Hidalgo
Foundations (FDN)
• #485Rulings
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.
(wotc • 2024-11-08)
Rulings
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.
(wotc • 2024-11-08)