In the ending credits, the Millennium Puzzle picture made with the names of the producers and YUGIOH
Like most Pokmon cards, the value of Electrode 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 (Chilling Reign)
In some cases, this is actually enough to push for game
Urzas Saga has a lot of good interactions with different artifacts in the Cube
Each Starter Deck also contains 3 Ultra Rare variant cards to power up your Decks further, so be sure to think which ones would make your Decks stronger
These are almost always written like this: You can X this by (from your Y) by doing Z. X being the form of Summon, Y being the place where you Summon it from (typically the hand), and Z being the way of Summoning/cost (if any), say by banishing a monster from the GY