Some of the classics are the various Niv-Mizzet cards, like Niv-Mizzet, Parun and Niv-Mizzet, the Firemind
Every color kills them
But then I saw the face commander and the reprint list
Keeper of Keys Most monarch cards care about accruing value or punishing your opponents for taking the monarchy, but Keeper of Keys takes a far more aggressive approach with its unblockable ability
(10/4/2019) If an effect allows you to cast a spell without paying its mana cost, you can't choose to cast it and pay unless another rule or effect allows you to cast that spell for a cost
Number 222 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (7/12/2019) If you discard a card but that card is not in your graveyard as Bag of Holding's first ability resolves, that card remains wherever it has moved