Theyre flavorful in the way they work and how theyre applied, and having cards with both improvise and convoke can make paying for some costs almost absurdly easy
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Its proven to be a damn good combination with bounce lands and cards like Amulet of Vigor, allowing you to start a sequence where you bounce a land, generate 2 mana, return another land to your hand, play it, tap to generate mana, play another land, generate 1 more mana, and so on
While Mega Gengar appeared in Phantasmal Flames, this card's artwork was saved for another English set, with its incredible cost likely to carry over into the English version
This allows you to sacrifice it, do damage, and revive it infinitely