Green ramp is a potent cube archetype
The card also has a lot of in-color synergy to abuse, like Living Death that recurs all creatures out to the battlefield
Conjurer's Closet $9.99 Blink engines appeal to a certain subset of players (guilty!) and Conjurer's Closet is one that can go in any deck
It's natural for Magic players to battle these together, and what's more natural is the styles the decks play
They are immune to removal, and when the Portcullis dies, they arrive to the battlefield anew
Aesi, Tyrant of Gyre StraitAesi, Tyrant of Gyre Strait's entire game plan is to get as many lands into play as possible, which means that by the late game you could be looking through a huge number of cards to put a key piece into your hand