There are plenty of ways to sneak your way around Equip costs in the deck
First, check for its rarity level by identifying the edition of the card
If this is in your deck, its worth having a quick Scryfall search to see what other beasts mirror your creatures mana costs
In the normal Synchro Summon, the levels of the Tuner monster(s) and non-Tuner monster(s) are added up to be equal to the level of the summoned monster, whereas Dark Synchro Summon subtracts the level of the non-Tuner monster from the anime-exclusive Dark Tuner monster monster's, instead
A chase card doesn't always have to be the single most expensive one in the set
Its a great way to express yourself. Stopping in to simply grab protective sleeves or dice, and not getting sucked into browsing the shop, is a task most will gleefully fail