Theres also Faramir, Steward of Gondor, which cares about monarch, creates humans, and supports a mini-subtheme of the deck with legendary creatures mattering
this has made me realize I havent looked that hard into some of the artists Pokmon work as I thought I had
Importantly, you can put more -1/-1 counters on a creature than it would take to get rid of it
Looking to pick up some Charizards of your own
Often, when we get a big famous Pokmon at the head of a new set, the result is that other cards featuring that Pokmon become more expensive and harder to get hold of
Here's how the deck looks with the upgrades added: Also to pre-emptively address some comments: one direction that you can take the upgrades is to really lean into Sliver Gravemother's encore ability and turn the deck into a straight-up Encore deck -- Buried Alive and Entomb cards to put slivers into your graveyard, Convergence of Dominion and Zirda, the Dawnwaker to make encore cost less (though PSA Training Grounds doesn't work, I see people suggesting it but sorry no), Mondrak, Glory Dominus to double the encore tokens, Sundial of the Infinite to keep the encore tokens permanently -- that sounds sweet and all but you'd need to do a massive rework of this entire precon, turning it from a Go Wide Sliver Combat deck to Sliver Reanimator essentially