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Heart of the Underdog
During your Draw Phase, when you draw a Normal Monster(s): You can reveal it; draw 1 more card.

Heavy Mech Support Platform
Once per turn, you can either: Target 1 Machine monster you control; equip this card to that target, OR: Unequip this card and Special Summon it. A monster equipped with this card gains 500 ATK/DEF, also if the equipped monster would be destroyed by battle or card effect, destroy this card instead.

Heavy Slump
If your opponent has 8 or more cards in their hand: They shuffle their entire hand into the Deck, then draw 2 cards.

Heavy Storm
Destroy all Spell and Trap Cards on the field.

Helping Robo for Combat
If this card destroys an opponent's monster by battle: Draw 1 card, then return 1 card from your hand to the bottom of the Deck.

Helpoemer
Cannot be Special Summoned from the GY. At the end of your opponent's Battle Phase, if this card is in the GY because it was destroyed by battle: Make your opponent discard 1 random card. This card must be in the GY to activate and to resolve this effect.

Hercules Beetle
A massive beetle with a tough carapace and a dangerous horn.

Hero Signal
When a monster you control is destroyed by battle and sent to the Graveyard: Special Summon 1 Level 4 or lower "Elemental HERO" monster from your hand or Deck.

Hibikime
Confuses enemy monsters with a noise that is harsh to the ears.

Hidden Spellbook
During your turn: Target 2 Spell Cards in your Graveyard; shuffle those targets into the Deck.