Restless Fortress
Land
This land enters tapped.
: Add 
or 
.
: This land becomes a 1/4 white and black Nightmare creature until end of turn. It's still a land.
Whenever this land attacks, defending player loses 2 life and you gain 2 life.
Piotr Dura
Wilds of Eldraine (WOE)
• #259Rulings
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.
(wotc • 2023-09-01)
If this becomes a creature because of an effect other than its own ability, its last ability will still trigger whenever it attacks.
(wotc • 2023-09-01)
Rulings
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.
(wotc • 2023-09-01)
If this becomes a creature because of an effect other than its own ability, its last ability will still trigger whenever it attacks.
(wotc • 2023-09-01)