Dermotaxi — ruling 1

The choice of what card is exiled is a replacement effect, not a triggered ability. Players can't respond to the card being exiled.

Dermotaxi — ruling 2

The imprint ability is linked to the activated ability that makes Dermotaxi a creature. This means that the second ability refers only to the card exiled by the first, even if it becomes a copy of something that later exiles other cards.

Dermotaxi — ruling 3

If you activate the ability, but there's no exiled card to reference (perhaps because there wasn't one in any graveyard to imprint), the ability does nothing. Dermotaxi won't become a copy of anything.

Dermotaxi — ruling 4

Dermotaxi does not have a crew ability. Activating the ability to have it become a copy of the exiled card doesn't count as crewing a Vehicle. If a creature you tap to activate the ability has a triggered ability that triggers whenever it crews a Vehicle (such as that of Gearshift Ace), that ability won't trigger.

Dermotaxi : règles, fonctionnement et interactions (MTG)

Dermotaxi 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

Imprint — As this Vehicle enters, exile a creature card from a graveyard. Tap two untapped creatures you control: Until end of turn, this Vehicle becomes a copy of the exiled card, except it's a Vehicle artifact in addition to its other types.

How it works : Dermotaxi

Original English text — Wizards of the Coast / Scryfall

#1June 18, 2021· Wizards of the Coast
The choice of what card is exiled is a replacement effect, not a triggered ability. Players can't respond to the card being exiled.
No other card is named in this ruling.
#2June 18, 2021· Wizards of the Coast
The imprint ability is linked to the activated ability that makes Dermotaxi a creature. This means that the second ability refers only to the card exiled by the first, even if it becomes a copy of something that later exiles other cards.
No other card is named in this ruling.
#3June 18, 2021· Wizards of the Coast
If you activate the ability, but there's no exiled card to reference (perhaps because there wasn't one in any graveyard to imprint), the ability does nothing. Dermotaxi won't become a copy of anything.
No other card is named in this ruling.
#4June 18, 2021· Wizards of the Coast
Dermotaxi does not have a crew ability. Activating the ability to have it become a copy of the exiled card doesn't count as crewing a Vehicle. If a creature you tap to activate the ability has a triggered ability that triggers whenever it crews a Vehicle (such as that of Gearshift Ace), that ability won't trigger.
No other card is named in this ruling.