There were massive creatures with huge drawbacks (Cosmic Larva, Desecration Elemental), a vertical cycle of Stations that went infinite with each other (Blasting Station, Grinding Station, Salvaging Station, Summoning Station), and a host of engines in search of a combo that turned one resource into another (Gemstone Array, Krark-Clan Ironworks, Clock of Omens)
5Ds Stardust Dragon
the Gods seemed to be able to revive the dead, since Yako was able to revive Keith Howard using the cards, and they were a major component of Yako's attempt to revive Pegasus by linking Anzu Mazaki to the Gods and using "The Wicked Avatar" as a medium
Although it can only be activated at sorcery speed, hence its inclusion here as a shout out, rather than a proper spot
Behold the terrifying manifestation of what will be, when all the spirits in the satellite is swallowed by darkness
Urabrask also has lots of benefits on the creature side