While that's not the most terrible idea, the likelihood in a Niv-Mizzet deck is that the other spell you're casting is a burn spell that could do the same, and I have to feel that you're going to be better off casting it by itself, rather than putting all your eggs in one basket
The Lady of the Lake herself graces this list with her generous abilities
We've seen this stat line before but this is the first time it has shown up in Ruby
Its my favorite format by a long margin, and theres far more flexibility in the deck building process due to the sheer volume of cards you have to choose from
A third Echoes of Eternity causes such abilities to trigger four times, a fourth causes such abilities to trigger five times, and so on
Others have keywords such as Support and other abilities that allow them to add their strength to other cards, presenting opportunities to combine your cards power together to challenge opposing characters and slow down your opponents