These three Equip Spells all increase the attack of a Mermail Monster by 400 or 800 points, and, more importantly, they each block one card effect Spell, Trap, or Monster depending on the particular Spell
Fusion Summon 1 Level 8 or lower Fusion Monster from your Extra Deck, except "Lubellion the Searing Dragon", by shuffling Fusion Materials mentioned on it into the Deck, from your monsters on the field, GY, and/or face-up banished cards
However, unlike Sorceries, Instants can be cast whenever you have priority, even on other players' turns
In fact it's quite possibly the most broken card in the game
When this attacking card inflicts Battle Damage to your opponent, your opponent selects and sends 1 card from their hand to the Graveyard, and you draw 1 card
While these monsters continue getting new support, the days of Dragon-type Fusion monsters like Five-Headed Dragon and Dragon Master Knight being the strongest cards in the game have long since passed due to the inclusion of better monsters from the Fusion, Synchro, Pendulum, and Link Monster card types