What happens if I use Deathgrip on a unit that is in the same location as Soraka and has less might than her?

If you use Deathgrip on a friendly unit that is at the same location as Soraka, Wanderer and has less Might than her, Soraka's replacement effect will trigger, saving the unit from being killed.

The Ruling

Because Soraka's ability is a replacement effect (Rule 366), it replaces the "die" event with a "heal, exhaust, and recall" event. Consequently, the unit is never actually killed. Since the condition "If you do" in Deathgrip is not met, the subsequent instruction to give Might does not execute.

Sequence of Events

1. Play Deathgrip: You target a friendly unit to kill and another friendly unit to receive the Might.
2. Resolution: As Deathgrip resolves, it attempts to kill the first unit.
3. Replacement: Soraka's ability replaces the death event with a heal, exhaust, and recall.
4. Condition Check: Because the unit was not killed, the "If you do" condition for the Might bonus fails.
5. Finalization: The Might bonus is not applied. However, you still draw 1 card, as the draw is not contingent on the kill.

This interaction is consistent with RiftJudge FAQ #8668, which clarifies that if you do not actually kill the target (for example, because its death was replaced), you do not give the second unit any Might, though you still draw the card.