mtg cards like arcane adaptation [46] [Ixalan] [Foil] – Face to Face Games An individual card from the Magic Arcane Adaptation : r/MTGSpec

Also, Whenever a creature is put into an opponents graveyard from the battlefield, you gain life equal to its toughness. The rulings around MTG have changed since this card was first printed, and the short of that is that it actually affects all opponents, which makes it incredibly good at gaining you life

However, even a weaker version of Knight is worth considering

Some folks might design packages around specific cards

Since wither isnt a replacement effect, abilities that trigger when damage happens still trigger for wither effects

If you stick Curiosity on Niv-Mizzet then all you need to do is draw a card (which is something Niv is pretty damn good at) and then you go off, in a flurry of draws and pings

This would allow players to get their Commander into action, and to worry less about it getting removed by their opponents