It could see play in decks that heavily rely on graveyard interactions, but its high mana cost may limit its inclusion in competitive decks
According to a post from Head Designer Mark Rosewater, we may well see more of this in the future, too
Aegislash has the following abilities: Cursed Metal: Attacks used by your Psychic Pokmon and Metal Pokmon do +30 damage to your opponent's Active Pokmon What attacks does Aegislash have
Blue and green sometimes have this flash deck that holds up mana for counterspells or card draw, with the possibility to flash in something like a Frilled Mystic or Nightpack Ambusher
Giving your creature protection from white and red also helps it to dodge a lot of removal, including staples like Swords to Plowshares or Path to Exile
Eternal Loops The potential for constant value with Enduring Renewal is high, but its also a nasty MTG combo enabler