Linde build

I recently got around to building my Linde since I pulled a great IV as a "pitybreaker" in the hero fest. I've decided to replace my neutral BLucina with her as a buffer in the arena since she's my highest merge and the team previously had no magic damage and the closest thing to a res tank being a dc/dd seal -res Azura.

She's +spd/-def, +5.
Her teammates are a Soleil and BIke. Also, Azura if I'm not doing arena.

She's got Dark Aura, Rally Def/Res (points and more BIke tanking), Glimmer, and Desperation so far.

My question is Swift Sparrow or LnD for the a slot? Or pray for Atk/Spd Bond?
And Drive Spd or Drive Atk for the c slot?

I have one spare Katarina lying around since her banner and I want Linde to keep her res as much as possible bc the team is otherwise lacking it, so I'd rather not go LnD unless she needs it. But she's my only spare unit with SS. And I plan to pull on the valentines banner in a few weeks, but there's no guarantees.

And for the c slot. BIke already has Drive Spd, so I'm leaning towards Drive Atk, but I'm still not sure which one would be better for the team since Dark Aura already gives +6 at the start of the turn.

Edit: The main reason I'm considering Drive Atk over Drive Spd is because both other units can use attack well, while only Soleil really benefits from speed. BIke has Drive Spd because both Soleil and Linde like speed. (Soleil has her native Drive Res, which can help Linde. I'll probably toss the Drive Def seal on whatever bonus unit I use so they'll always be useful unless they really want a different one.)

Edit: I wound up whaling a bit earlier than I should have and came away with a pair of LALyns ready for foddering.