The Brineborn Cutthroat and Spectral Sailor cards are both Flash cards, designed to jump into play during an opponent's turn, either to block incoming attacks or otherwise harass opponents
Treasure tokens can especially help you cast cards with improvise, waterbending, or affinity for artifacts like Battle at the Bridge, Spirit Water Revival, or with Tezzeret, Master of the Bridge
There are plenty of good ways to deal with creatures, so as long as you save them for the right targets, it is mostly about small edges, synergy, using your cards at the right time, a timely combat trick or double-block, and executing your archetypes game plan correctly
Targete Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Wizards of the Coast didnt officially adopt the fan-made format until 2011