Pull to the Grave

When Pull to the Grave enters the battlefield, exile
target creature with power 3 or less until Pull to the
Grave leaves the battlefield. (That creature returns
under its owner's control.)

At the beginning of your upkeep, you may put a
card exiled with Pull to the Grave into its owner's graveyard. If you do, return Pull to the Grave to its
owner's hand.

The branches turned out to be naiad limbs.