Does Deathgrip draw if target unit is removed?

Yes, you will still draw one card.

According to RiftJudge FAQ #10082, #10334, and #10055, the draw effect of Deathgrip is not contingent on the success of the kill or the Might bonus.

Why this happens:

1. Partial Resolution: When you play Deathgrip, you must target two friendly units (one to kill and one to receive Might). If one of these units is removed (e.g., via Gust) before Deathgrip resolves, the spell still attempts to resolve as much as possible (Rule 359.3.e.11).
2. Target Legality: If the unit targeted to be killed remains on the board, it is destroyed as instructed. Even if the unit targeted to receive the Might bonus is removed and the bonus cannot be applied, the spell continues to resolve.
3. The Draw: Because the "Draw 1" instruction is not linked to the success of the kill or the Might bonus, it is performed regardless of whether those previous instructions successfully executed or were rendered impossible due to mistargeting.

Summary: As long as the spell itself was played legally (by having two valid targets at the moment it was placed on the chain), you will draw one card when it resolves, even if the targets leave the board in the meantime.