Even in a low-value scenario, giving your opponent a poison counter for one mana is very efficient, and can even be enough to end the game
Like most Magic: The Gathering cards, the value of Starscream, Power Hungry // Starscream, Seeker Leader depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Transformers)
Bloodforged Battle-Axe duplicates itself whenever the equipped creature deals combat damage
So maybe 5% of yugioh production
#17 GameStop equivalent in NZ is EB Games
The five key "Atlantean" monsters are "Neptabyss, the Atlantean Prince", "Atlantean Dragoons", "Mermail Shadow Squad" (which is always treated as an "Atlantean" card), "Atlantean Heavy Infantry", and "Atlantean Marksman"