Firstly, you need a deck of exactly 60 cards
1999 Pokemon 1st Edition Chansey holo #3 PSA 10 sold for $34,800 Chansey holo #3 PSA 10 sold for $34,800 Due to manufacturer issues that cause significant scratching on the holographic part of the card, the 1st Edition Base Set Chansey has consistently ranked among the most challenging cards to grade ever released by Pokemon, with a PSA 10 population of only 48 copies
In conjunction with the Area Zero Underdepths stadium, this card can deal 240 damage, which makes it strong enough to deal with Raging Bolt without needing tools like Defiance Band or Maximum Belt
It is also hitting highs of over $100 compared to the Ultra Ball's $50 (not that price is everything!)
Karlach, Fury of Avernus is itself a red commander, but with the added benefit of background as your second commander
Winters card drawing ability is also easily abusable