Alterations would likely be considered derivative works under copyright law, which only WotC would have the right to create as the copyright holder, unless it granted an artist permission
Whether the card features Mitsuhiro Arita's iconic original artwork from Base Set, a Shining alternate colorway from the WOTC era, a Gold Star treatment from the mid-2000s ex era, or a Special Illustration Rare from the latest generation, the Charizard name elevates every card it touches to a level of value and desirability that no other Pokemon can consistently match
Rerolling a die prevents the original roll from ever happening
And finally, at level 3, you get to draw an extra card for each opponent who has one or fewer cards in hand, which in a game of Commander, can draw you up to three bonus cards in a turn
Removing two 1/+1 counters for a card seems bad, especially considering it costs 6 to cast
Japanese versions are only found in Japanese-language Collector Boosters, with English versions in all other languages of Collector Booster