Once you’ve activated the ability granted by Frondland Felidar, causing the creature to lose that ability (such as by removing Frondland Felidar from the battlefield) won’t affect the ability on the stack.
17-04-2020
wotc
Frondland Felidar’s last ability applies to itself as long as it still has vigilance.
17-04-2020
wotc
You can activate the ability granted by Frondland Felidar after attacking but before blockers are chosen.
17-04-2020
wotc
Tapping an attacking creature doesn’t remove it from combat.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.
, 
: Tap target creature.”
Steve Prescott2020-04-24
