Flash (You may cast this spell any time you could cast an instant.)
Whenever you cast a spell during an opponent’s turn, put a +1/+1 counter on this creature.
Brineborn Cutthroat's ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
12-07-2019
wotc
Brineborn Cutthroat must be on the battlefield for its last ability to function. Notably, the ability won't trigger as you cast Brineborn Cutthroat during an opponent's turn.
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.