Taking the core rules of Magic, and slightly tweaking the rules really opens up the game to a whole world of deck types, crazy combos and otherwise useless cards seeing a tonne of play
That's very strong, and many commonly played 3 or smaller toughness Commander Classics are killable with this, like Hate Bears like Esper Sentinel, Goblin Welder, Flametongue Kavu, Eternal Witness, Soul Warden, Ravenous Chupacabra, and loads more
Speaking of which, some new goodies to gush about: Trenchpost: The first locus land printed since Scars of Mirrodin
It indicated that the abilities of the card had a cost, which required you to tap the artifact during play
It's a regeneration ability away from being the worst creature ever
Art Series can be legal in some formats and banned or restricted in others