Fortunately, cards like Acquire or Knowledge Exploitation and artifacts like Ring of Three Wishes or Planar Bridge can help you in a pinch, but these tend to be very mana intensive or situational, so I recommend using them sparingly
On the other, you have Awakening Hall, which is a much worse Rise of the Dark Realms
A spell you cast from your hand with Rebound is never put into the graveyard, so effects that care about cards going to your graveyard won't trigger
Locking some decks out of their mana generating artifacts can also offer you a quick and easy win
Subtlety shows up in decks like Temur Rhinos and Izzet Control, where keeping tempo and dodging sorcery-speed threats is everything
If you cast Snapcaster Mage to flashback a spell from your graveyard, then the Mage supplies you with a creature on top of whatever other card you get to cast again