Samut, the Driving Force
Legendary Creature — Human Warrior Cleric
First strike, vigilance, haste
Start your engines!
Other creatures you control get +X/+0, where X is your speed.
Noncreature spells you cast cost 
less to cast, where X is your speed.
Chris Rallis
Aetherdrift Promos (PDFT)
• #222pRulings
“Max speed — [ability]” means “As long as you have max speed, this object has [ability].” If the granted ability functions in a zone other than the battlefield, the max speed ability does too.
(wotc • 2025-02-07)
Each player tracks their speed (or lack thereof) separately. Increasing your speed has no effect on whether another player has speed.
(wotc • 2025-02-07)
If an effect needs to know what a player’s speed is and that player doesn’t have a speed, their speed is considered 0.
(wotc • 2025-02-07)
Your speed doesn’t change until a spell or ability says so, such as the inherent triggered ability that cares about opponents losing life during your turn. Notably, losing control of permanents with start your engines! doesn’t affect your speed.
(wotc • 2025-02-07)
A player “has max speed” if their speed is 4.
(wotc • 2025-02-07)
Start your engines! isn’t a triggered ability. Increasing your speed to 1 is something that happens as a state-based action as soon as you control a permanent with the ability. Notably, this includes gaining control of a permanent with the ability that another player controls.
(wotc • 2025-02-07)
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Rulings
“Max speed — [ability]” means “As long as you have max speed, this object has [ability].” If the granted ability functions in a zone other than the battlefield, the max speed ability does too.
(wotc • 2025-02-07)
Each player tracks their speed (or lack thereof) separately. Increasing your speed has no effect on whether another player has speed.
(wotc • 2025-02-07)
If an effect needs to know what a player’s speed is and that player doesn’t have a speed, their speed is considered 0.
(wotc • 2025-02-07)
Your speed doesn’t change until a spell or ability says so, such as the inherent triggered ability that cares about opponents losing life during your turn. Notably, losing control of permanents with start your engines! doesn’t affect your speed.
(wotc • 2025-02-07)
A player “has max speed” if their speed is 4.
(wotc • 2025-02-07)
Start your engines! isn’t a triggered ability. Increasing your speed to 1 is something that happens as a state-based action as soon as you control a permanent with the ability. Notably, this includes gaining control of a permanent with the ability that another player controls.
(wotc • 2025-02-07)