It is recommended for all people who only just started to play duel links but at least one structure deck. But aside from that, people who want to build E-Hero themed decks are recommended to buy this Box.
If this card is Normal or Special Summoned: You can add 1 "Polymerization" from your Deck to your hand. During your Main Phase: You can activate this effect; you cannot Special Summon monsters for the rest of this turn, except Fusion Monsters, also send 1 "Elemental HERO" monster from your Deck to the Graveyard, except "Elemental HERO Blazeman", and if you do, this card's Attribute, ATK, and DEF each become the same as the monster sent to the Graveyard, until the end of this turn. You can only use 1 "Elemental HERO Blazeman" effect per turn, and only once that turn.
When this card is destroyed by battle and sent to the Graveyard: You can banish this card and 3 "Elemental HERO" Monster Cards with different names from your Graveyard to target 1 Normal Spell Card in your Graveyard; add that target to your hand.
"Elemental HERO Heat" + "Elemental HERO Lady Heat" Must be Fusion Summoned and cannot be Special Summoned by other ways. If this card battles a WATER monster, this card gains 1000 ATK during the Damage Step only.
When an opponent's monster declares an attack: Your opponent chooses 1 random card from your hand, then if it is a monster that can be Special Summoned, Special Summon it. Otherwise, send it to the Graveyard.
The fact the third-best card in the deck (after Blazeman and Fusion Recovery) is a toss-up between A Hero Emerges and Elemental HERO Heat is all you really need to point out to prove this structure deck is pretty bad. If you get the deck, it's basically just going to be for Blazeman. Cards like Flash and Lady Heat are just plain garbage.
You need 3 blazmema(n) to play miracle fusion heroes. Yep, it needs kinda a lot of techs to be competitive, maybe it can be done with 2 blazeman(s) as well
Using this in the loaner deck duel is making my blood boil -- who would ever want to buy this garbage? The only reason Loaner Deck Duels exist is to get you to try out new cards, and convince you to buy the decks/packs, but this one is nightmare dogshit trash.
Heat, Blazeman, and Fusion Recovery are all pretty good cards in heroes, don't know why everybody is calling this garbage. The deck on its own isn't good, but none of these structure decks are, you are supposed to modify them after purchase to make them good
Probably because Heroes themselves aren't very good. (Not counting Destiny HEROes, which I don't think were what you were referring to.) Fusion Recovery is probably the only card the average player might use here, though Blazeman is also solid. (And sees a little use due to Slash Dragon.)