Restless Vinestalk — ruling 1

If this becomes a creature because of an effect other than its own ability, its last ability will still trigger whenever it attacks.

Restless Vinestalk — ruling 2

If this becomes a creature but you haven't controlled it continuously since your most recent turn began, you won't be able to activate its mana ability or attack with it that turn.

Restless Vinestalk : règles, fonctionnement et interactions (MTG)

Restless Vinestalk is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

This land enters tapped. : Add or . : Until end of turn, this land becomes a 5/5 green and blue Plant creature with trample. It's still a land. Whenever this land attacks, up to one other target creature has base power and toughness 3/3 until end of turn.

How it works : Restless Vinestalk

Original English text — Wizards of the Coast / Scryfall

#1September 1, 2023· Wizards of the Coast
If this becomes a creature because of an effect other than its own ability, its last ability will still trigger whenever it attacks.
No other card is named in this ruling.
#2September 1, 2023· Wizards of the Coast
If this becomes a creature but you haven't controlled it continuously since your most recent turn began, you won't be able to activate its mana ability or attack with it that turn.
No other card is named in this ruling.