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Teysa Karlov creates double the value for your creatures dying, and commands this deck full of ways to sacrifice creatures with great triggers - especially those that generate creature tokens for Teysa to give vigilance and lifelink with her secondary ability
In addition to this primary plan, the deck also features a potent backup combo: Tameshi, Reality Architect paired with Lotus Bloom can generate immense amounts of mana, often culminating in an enormous Sea Gate Restoration that seals the game
One might argue that this is a "win more" card but given how much Marath wants you to have lots of mana, I think it's worth including
Jhoira doesn't care just about artifacts but all historic cards, and some people don't like that because they feel she should just be about artifacts