For this ranking, I mainly focus on cards that have flashback themselves, and leave out most cards like Snapcaster Mage that give this static ability to instants and sorceries in your graveyard
Read More: This Simian Spirit Guide sold for an awful lot 9 Whip of Erebos GIving all of your Creatures lifelink is a very easy way to gain a lot of life, but its damn effective
This won't create big plays, but it will always be there when you need it
No real other requirements anywhere, play as aggressive or controlling as you want, and the card is going to do some heavy lifting either way
This card is nuts and the only real drawback that it includes is only tapping for colorless mana if you're using the mana for anything else
I've never done this myself, but it's not for lack of trying: Archangel Elspeth in a long game can re-buy any number of lost Caretaker's Talents, Sanguine Evangelists, and Carrot Cakes