2 / 2
Threshold — As long as seven or more cards are in your graveyard, this creature gets +1/+1 and has "

: Target attacking or blocking creature gets +3/+3 until end of turn."
Once you activate the ability Vigilant Sentry gives itself, it doesn’t matter what happens to the number of cards in your graveyard. That ability will still resolve even if that number drops below seven in response.