You lose if any one of the Liches leaves the battlefield
The Fossil Card may be more useful to you here than Meowth, given that it allows us to counter the Sabrina Supporter Card and keep the benched Pokemon that we are building safe
Id wager that each point of Afterlife is worth ~0.75 mana (see this article for more info on how much other abilities cost), so Orzhov Racketeers could theoretically be a 4/4 or even a 5/4 insteadwhich is fine, but probably going to trade down in combat

Unfinity Collector Boosters Collector Booster contents: 1 Traditional foil planetary space-ic basic land, orbital space-ic basic land, or borderless shock land 1 Galaxy foil planetary space-ic basic land, orbital space-ic basic land, or borderless shock land 1 Galaxy foil or traditional foil Booster Fun rare or mythic card (will be a showcase or borderless planeswalker card) 1 Traditional foil rare or mythic rare (cannot be a showcase or borderless planeswalker card) 1 Galaxy foil rare or mythic rare (cannot be a showcase cards of tomorrow or borderless planeswalker card) 1 Galaxy foil common or uncommon (cannot be a showcase card) 1 Galaxy foil or traditional foil showcase uncommon 1 Traditional foil Attraction card of any rarity 4 Traditional foil commons 2 Traditional foil uncommons 1 Traditional foil double-sided token 1 Traditional foil card from The List for Unfinity Every Unfinity Collector Booster comes with two full-art lands, one traditional foil and one galaxy foil

In the games beginning, rarity was a byproduct of physical print sheets, leading to inconsistent card numbers