Both Memento and Lunalight have very strong engines, and can play through boards pretty well
Synchro Wind Pegasus @Ignister shuffles a card on field back to the deck, while PSY-Framelord Omega shuffles a card in the graveyard back to the deck
Harvey Walters Professor Walters began as a devotee of the archaic and obscure, but over the years, he has discovered that his knowledge of ancient languages, profane relics, and strange rituals is vital to addressing dangers in the modern day
Rereleasing these exclusive cards is still important for longtime collectors who may have yet to have the chance to get their hands on them, but it wouldn't be surprising if rereleasing these cards is a low priority for Konami
This is likely due to the timing of the errata to "Trishula" as Hidden Arsenal 4: Trishula's Triumph did not release until just over three weeks before the game was released in North America and released after the game was already out across Europe