Competitive MTG plays a lot of 1-mana spells, from creatures to instants and sorceries
Hes sure to draw some comparisons to Yidris, Maelstrom Wielder due to his focus on turning sideways with trample in order to enable cascade, but the fact that he doesnt need to connect with an opponent is definitely a big advantage
The 7 mana worries me less since black has things like Dark Ritual, Cabal Coffers, and Crypt Ghast in it's arsenal
Death Toll: Send your cold dead cards into the graveyard, then return your heavy hitters from the great beyond and rise victorious
Electrolyse Electrolyse is presently the second most popular Izzet card and by quite a margin as well
As a result, Sword of the Meek could be an emblematic weapon for mice attempting to take on far larger creatures