You gain life equal to the sacrificed permanent's mana value
Gumblar Dragons got excellent stats, an easy summoning condition, it forces the opponent to discard multiple cards per turn and will do burn damage to add insult to injury
In Commander, where all these cards are legal, nothing but Rule 0 (and self-preservation?) is stopping you from doing stuff like Urborg, Tomb of Yawgmoth and Kaervek, the Spiteful and then casting Kormus Bell
Ok Vulpix [Rainbow Foil] #37 (Pokemon 1999 Topps TV) Details All prices are the current market price
Check out his page for a few more awesome reworks of anime cards
The best example of this takes place in the best XYZ deck in the last five years, Purrely, as it has some of the most unique mechanics for an XYZ-focused deck that the game has ever seen