mtg ghoulcaller gisa commander deck (Foil Etched) [Commander Masters] – TokenMTG where X is the sacrificed creatures power. Mtg 2014 Commander Mythic Rare

Like many fracturefoils, the base printing of Devastating Onslaught isn't worth too much

And, although he doesn't affect the other Duck Tales cards, they can affect him

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The colourless mana cost and artifact typing is just the cherry on top

If you're not a lands deck and you're not playing off-color fetches like some sort of monster, then chances are good that this isn't a mana dork most of the time, which just leaves the life loss ability (which is a bit of a pittance that you're not going to want to hold open mana for most of the time) and the lifegain effect (which is fine if you need it to guarantee some triggers)