Its death by a thousand cuts, but those cuts add up really fast when you produce tokens from Reverent Hoplite, Evangel of Heliod, and similar effects while doubling down on those triggers with Delney and doubling those tokens with cards like Anointed Procession
It might not look like much at first glance, but Delver is so strong that they named an entire deck archetype after it in Magic's cheaper competitive format, Pauper
Examples of watermarks are the guild symbols in Ravnica sets, the clan symbols in Khans of Tarkir block, the Mirrodin and Phyrexian symbols in Scars of Mirrodin block, and the Planeswalker symbol on the story spotlight cards
Approach of the Second Sun Approach of the Second Sun was probably one of the most commonly played of the alternate win conditions during its Standard run in decks that actually won tournaments
Rogue's Passage: a great land