Instants are great, who knew
For self-mill players, it offers a simple yet powerful advantage in card draw, and its land sacrifice is effective with common self-mill payoffs like Splendid Reclamation and Aftermath Analyst
Abilities that affect multiple players are resolved in the same way - starting with the player whose turn it is, each player takes the required action, and then passes to the left
For example, if two creatures you control with lifelink deal combat damage at the same time, Elenda's Hierophant's second ability will trigger twice
Just playing a creature that makes a token every turn is fine, and you can make them on your opponents turns, too
It might take you a couple of extra turns to bring out your most powerful sapphire cards, but once you do itll be hard to stop you