Like most Magic: The Gathering cards, the value of Runic Armasaur 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 (Core Set 2019)
Originally, the finisher was Predator Dragon, but I imagine today it would be some combination of Craterhoof Behemoth and Emrakul, the Aeons Torn coming down on Turn 2 or 3
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These cards offer players a unique method of countering attacks
Features powerful Pokemon like Pecharunt ex, Okidogi ex, Munkidori ex, and Feandipiti ex, with shadows and nefarious tricks
Powerstones have limited use, but you can usually find a mana sink to filter the mana through, if not just use them as fodder for some artifact sacrifice engine