Niv-Mizzet, the Firemind [Champs and States] Human Shapeshifter Assassin if one or more of

if one or more of them entered from a graveyard or was cast from a graveyard

put a +1/+1 counter on each of up to X target creatures

Set: Legends Type: Instant Rarity: Common Cost: {G} Counter target instant or Aura spell that targets a permanent you control

Set: Streets of New Capenna Commander Promos Type: Enchantment Rarity: Rare Cost: {2}{W} At the beginning of each end step

Niv-Mizzet, the Firemind [Champs and States] Human Shapeshifter Assassin if one or more ofSet: Champs and States Type: Legendary Creature Dragon Wizard Rarity: Rare Cost: {2}{U}{U}{R}{R} Flying Whenever you draw a card, Niv Mizzet, the Firemind deals 1 damage to any target. {T}: Draw a card.