Whats good in Commander is often terrible everywhere else, so having a surplus of these in a Standard set - or even one meant for Modern and beyond - often detracts from the number of cards thatll actually see play in that format
Being forced into using this for like six mana just because you need to buy as long as possible before the card in question comes back starts to look very poor on tempo
Izzet continues to be the best overall shell despite various bans
Though undoubtedly strong, this card is probably a bit too slow to be main-deckable in Modern: three mana for the sword, two more to actually equip it, and then you have to get through to deal combat damage as well
Here are my first five allied lists for you to check out: P.S
At 2 mana, youll appreciate it as an early play, and your late game will like the extra cards in your graveyard