Whenever you sacrifice a permanent, put a +1/+1 counter on Korvold and draw a card
As Polygon notes, The Pokmon Company has made clear that, when fans distribute art featuring any of the companys copyrighted intellectual property, they are agreeing to a royalty-free, non-exclusive, irrevocable, transferable, sub-licensable, worldwide license that gives it the right to use, transmit, copy, modify, and display Fan Art (and its derivatives) for any purpose. Legally speaking, that means TPC would have been in the clear to keep the immersive Ho-Oh as is
Each Half Deck contained a random assortment of Pokmon that were exclusive to its type and Colorless-type Pokmon
Collector Boosters Flashy cards
This can set up some second tactics centered around attacking several opponents
Just keep in mind you might also need some mana generation to make the most of all the cards coming into your hand