The coolest thing to me is how much flexibility players will now have when building assassin-themed Commander decks: one might choose to attack with an army of slippery unblockable killers, racking up different player-damage triggers
Confirmed Monsters Inc
The first truly notable one was Tormod, the DesecratorTormod, the Desecrator, but others quickly followed suit, like Quintorius, Field HistorianQuintorius, Field Historian, Amzu, Swarm's HungerAmzu, Swarm's Hunger, and Satoru, the InfiltratorSatoru, the Infiltrator
Its nice to be able to temporarily resurrect a creature that may have died in an attack to use again, and it allows you to use looting effects to help you cheat out big creatures