Note that you can only save up to 15 cards, though
Typically when the opponent has no monster to be banished by me reviving a Felgrand I will revive Leyvaten instead in order to maintain the floater looping
Playing things at instant speed is usually, if not always, better to have available
The reason why it's not a strict upgrade is because Mirrormade can copy artifacts as well
If Lutri, the Spellchaser had an ability that actually rewarded you for jumping through the huge hoop of playing all one-ofs, it might have a chance in constructed formats, but being a bad version of Dualcaster Mage that can only target your own spells and comes with the additional safety valve of only working if you actually cast Lutri (taking blink shenanigans off the table) just isn't enough of a reward compared to the high cost in consistency you pay for making Lutri, the Spellchaser your companion
2010: Emrakul, the Aeons Torn from Rise of the Eldrazi The year 2010 was pretty broken, which makes picking the single most broken card from the year pretty tricky