Depala is a hotshot pilot who's good at crashing Vehicles into things. Mostly other players.
Depala, Pilot Exemplar's third ability is a powerful form of card advantage in a color pair that desperately needs it. As long as you fill your deck with Vehicles you can can be fairly certain of drawing a card for every two mana (or so) you pour into her. Plus, since her ability activates whenever she taps, she can spend her time crewing those Vehicles and avoiding combat herself.
White-red is an aggressive color pair, and Vehicles are aggressively-costed creatures as long as you can crew them up. That means Depala is at her best in a fast (and furious) beatdown deck.
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