Yuri Umemura has illustrated 6 Pokémon cards across 4 sets, from 2010 to 2012. The most valuable is Entei at around $82.20.
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Their earliest card is Entei from HGSS Black Star Promos, and the most recent is Poké Ball from Boundaries Crossed. They have drawn Entei more than any other Pokémon (2 cards), followed by Groudon and Kyogre.