Not only is it difficult to determine which cards are good enough, there has to be enough other cards that also pair well with them in order to make a wedge viable in the Standard metagame
After doing that, theres no particular order to spending the rest of your turn, and you can do them any number of times as long as you have the ink to spend, and cards out in the field are not exerted
The higher the bracket, the more tools the deck has to succeed in competitive, meta-focused gameplay
Ethersworn Sphinx Im happy to play Ethersworn Sphinx in decks that can reliably cast it for 4 or less mana, a pretty achievable goal
Then exile it.) "Flashback [cost]" means "You may cast this card from your graveyard if the resulting spell is an instant or sorcery spell by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack." You must still follow any timing restrictions and permissions, including those based on the card's type