Similar to how the Rex dino decks work with Order to Charge, this deck uses mostly normal monsters and using support cards to sacrifice one to get rid of one monster. The difference being, Venus can easily summon some Mystical Shine Ball to be the sacrifice, opening them up for a direct attack right after it.
Order to Charge, Mystic Box and Enemy Controller
If you have Venus in your starting hand, summon her first if you have one of any of the support cards. During your first turn, set the Shine Balls in defense position. You can use them in attack position if you have Mystic Box or Order to Charge to either deal damage or get rid of a monster. Enemy Controller can be used if your opponent summons a high attack monster, use the shine balls as sacrifice to take control of it. Do this if you are sure that your total attack can already kill them, or if you have Order to Charge set on the field.
Going against field spells
Yami Yugi with "Power of Dark"
Since Venus is fairy type, her attack will be lowered from Yami's effect. This will put you at a big disadvantage since it increases your opponent's monster's attack, while decreasing yours. While it is tempting to use a Harpy to destroy the Yami right away, it is always better to save the spell destruction to destroy the back line spell cards if you plan to attack. This is because the deck is made to use with Order to Charge to get rid of enemies easily. Dealing lower damage with Venus is fine, as long as you have some protection cards like Order to Charge or Two-Pronged Attack.
Mako Tsunami with "Mythic Depth"
When going against Mako decks with Umi, you don't have to destroy Umi right away if you have an Order or Two-Pronged. This is to bait your enemy to use more cards to summon Levia-Dragon - Daedalus when they don't expect that you can destroy it easily. Use either of them the moment Daedalus/Suijin is summoned. If you don't have an answer to counter Daedalus' effect activation, then destroy Umi early in the duel or immediately when the duel starts.
Mai Valentine with "Harpie's Hunting Ground"
Same thing when going against a Mai with Harpies' Hunting Ground, you can either bait them with Order to Charge using Shine Balls or just destroy the field spell immediately.
It's important to keep in mind that Harpies' Hunting Ground REQUIRES you to destroy a spell/trap card when you summon them. If it's your first, turn then don't summon them if your opponent does not have any field spell that you want to destroy, otherwise your only targets are your own cards.
Harpie Lady, Harpie Lady 1, Harpie Lady 2 and Harpie Lady 3 are always considered 'Harpie Lady' even outside of duels. There are other Harpie cards that have a similar effect. Harpie Queen and I think also Harpie Channeler are only considered Harpie Lady while on the field or Graveyard, like Gemini monsters.
Seems like this deck emphasizes Venus + tribute spell effects more than the Harpies themselves. Destroying spells/traps on summons with Hunting Ground is cool, but apart from that, the Harpies are so weak. Seems like this deck would be a little better as a more generic beatdown deck, or maybe a Dino deck.