digimon card game starter deck venomous violet ST-6… Each deck also contains 16 types of card SkullSatamon [ST6-10] [Starter Deck: Venomous

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Its easy to see why this is one of the most valuable cards in Pokmon 151

It's easy to misplay Nexus with copy effects, since a single Nexus still in play will prevent the extra turns afforded by the copies, but you can still chain a bunch of turns together by copying this, then sacrificing the original

For others its the game itself

Its first attack, Backdraft, can deal 30 damage times the opponent's number of discarded basic energy , meaning it can deal immense damage to even powerful ex-cards

The artwork on Energy cards is usually a good indicator of what they do