You also need to make sure you hit your land drops, either with draw effects (Qiqirn Merchant and Adventurers Airship provide usable bodies as well as draw smoothing) or cards that directly give you lands or mana (World Map, landcyclers, Blitzball)
How can I increase my chances of pulling a rare card in Lorcana The First Chapter
without that synergy, theyre probably worse than a tapped dual with subtypes, like the ones from Dominaria United, or duals like the gain lands that do something
While you can play around with this if you want, if you're new, you may want to use it as a relatively strict guide
That means a card with two inks can only go in a deck with those two inks and no more
In FF7, this creates an epic boss battle that can be somewhat difficult depending on how early on you take the fight in the original game, and how prepared you are in Rebirth