The energy symbol on a real card will not take up the entire circle it is in
That means that if you play Frodo, Determined Hero when Swiftfoot Boots is in play - which grants hexproof and haste - you can attack straight away and it cant be targeted, and the attack will trigger the effect again, allowing you to put another equipment card on the Ring-bearer
Dark Magic Circle [Continuous Spell Card] When this card is activated: Look at the top 3 cards of your Deck, you can reveal 1 Dark Magician or 1 Spell/Trap Card that lists the card name Dark Magician in its text among them and add it to your hand, also after that, place any remaining cards on the top of your Deck in any order
My answer is basically the same one a carpenter would give if you ask him why he likes the hammer so much
Exodia Necross (Ultra Rare) Dark Crisis (25th Anniversary Edition) (DCR-EN) UNLIMITED PSA 9 Image 1 of 1 Yu-Gi-Oh
The card's first effect is less important, but provides decent utility, as the card is treated as "Dark Magician" when it is on the field or the GY