Start your engines!

Start your engines! is a keyword ability introduced in Aetherdrift. It is associated with speed.
==Description==
The first time in a game you control a permanent with "Start your engines!", your speed becomes 1. This happens immediately, so no one can respond and try to remove the permanent before you pick up speed. Once your speed is 1 or greater, you can trigger an ability to increase your speed. That ability is "Whenever one or more opponents lose life during your turn, if your speed is less than 4, increase your speed by 1. This ability triggers only once each turn." This ability isn't tied to any permanent. For the rest of the game, it can be triggered as long as your speed is less than 4, no matter what permanents you control.
The mechanic, as a progressing player status, resembles a stripped-down version of The Ring Tempts You and the initiative, both mechanics that notably were not introduced in Standard. The closest analogue in that regard would be Ascend.
Cards may reference your current speed and reward you based on that number.
===Max speed===
Once your speed is 4, you've achieved "max speed," and your speed can't go any higher. Some cards, have abilities that care if you have max speed. These abilities are noted with "Max speed — [Ability]." That means that as long as you have max speed, meaning your speed is 4, the permanent has the stated ability.
==Rulings==
*If you haven't started your engines and don't have speed yet, that number is 0.
==Example==
==Trivia==
*A card named originally appeared in Kaladesh.
==References==