Maybe someone Fogged or has a blocker with first strike or indestructible
The issue is that the floor of the card (when its only making three or four mana) is still way too high, because Dockside is a card that can be looped, reanimated, flickered or cloned to such a degree that simply making an extra treasure or two is still enough to win the game
Restless Fortress The attack trigger on Restless Fortress makes the card appealing to lifegain decks that want every scrap of lifegain possible
Haste makes Glorybringer shine
By now, experienced fans have been playing MTG for ten, fifteen, or even twenty years, and will have a collection of valuable cards to prove it
Magic Madhouse blog can help players reviewing the trends within the competitive community in order to tailor their decks to face different match-ups