When on the field this card is unaffected by card effects
Yes, few things can stand against 100 damage, but the fact stands that unless youre continuously throwing Double Colorless Energy (DCE) at Charizard, itll only be able to attack once per two turns
It's a tactical maneuver that demands sacrifice for a rush of new cards, perfect for decks that don't mind sending their own to the grave, or deploys a draw-pain strategy on its opponents

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The difference between it and Konamis Yu-Gi-Oh!, is that the original game that it spawned was co-designed by some of Wizards developers
Soldier of the Pantheon and Mardu Woe Reaper are probably necessary evils just to get that one drop count up