Nantuko Monastery

{T}: Add {C}.
Threshold — {G}{W}: This land becomes a 4/4 green and white Insect Monk creature with first strike until end of turn. It's still a land. Activate only if seven or more cards are in your graveyard.

Dominaria Remastered

{T}: Add {C}.
Threshold — {G}{W}: Nantuko Monastery becomes a 4/4 green and white Insect Monk creature with first strike until end of turn. It's still a land. Activate only if seven or more cards are in your graveyard.

Archenemy

{T}: Add {1} to your mana pool.
Threshold — {G}{W}: Nantuko Monastery becomes a 4/4 green and white Insect Monk creature with first strike until end of turn. It's still a land. Activate this ability only if seven or more cards are in your graveyard.

Judgment

oc
T: Add one colorless mana to your mana pool.
Threshold o
Go
W: Nantuko Monastery becomes a 4/4 green and white creature with first strike until end of turn. It's still a land. (Play this ability only if seven or more cards are in your graveyard.)

A noncreature permanent that becomes a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature. Notably, if you turn Nantuko Monastery into a creature on the turn it entered the battlefield, you won't be able to tap it for mana.

After it becomes a creature, Nantuko Monastery will still have all its abilities.

Once you activate the last ability, it doesn't matter what happens to the number of cards in your graveyard. Nantuko Monastery will remain a creature that turn even if that number falls below seven.