Even your slower turns can set up future creatures to enter play already transformed
Then your promo printings do count
However the myriad ways in which magic players shuffle dont always conform to that model
There are a number of great ways to make your instants and sorceries cost less (Curious Homunculus being one of them), but the best of these cards in blue is probably Wizards of Thay
Instead of lifegain for lifegain's sake, which is a common theme among angels, Liesa takes the life you gain through cards such as Bishop of Wings or Righteous Valkyrie and pumps it right back into casting spells your opponents may be more hesitant to play
They play your turn, draw your land, do nothing with it, cast your best spells at the worst possible targets, and then swing in with your Creatures against the player playing deathtouch tribal