There are a number of resources out there that allow you to plug in your decklist and get a breakdown of what percentage of your cards need specific colors of mana, what the average converted mana cost of your cards is, and other helpful information (Im partial to Tapped Out personally)
Legendary Creature - Angel Color tag templates(None) Bladewing the Risen Flying When Bladewing enters, you may return target Dragon permanent card from your graveyard to the battlefield
Miraris Wake does just that: every time you tap a mana (no matter if its a basic or one of the best lands in MTG ), you also get 1 mana of each type produced
They let you get an additional copy of the best creature you control, something thats not really supposed to happen in a singleton format
Wedding Announcement is definitely balanced for Standard, offering a couple of cards before transforming into an anthem
While this is a pretty small hurdle to jump through already, modern MTG cards have made it even easier