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Interestingly, Megaform can summon itself from the graveyard via banishing Machina Fortress from the graveyard, which means all those discard costs from before provide a useful way to bring out Megaform while summoning other big monsters

You get that card added to your collection, but the original owner doesn't lose a card

The alternative commander is Kotis, Sibsig Champion, which, once per turn, lets you cast creature spells from the graveyard if you pay their original cost and exile three cards from there as an additional cost

Obviously, this is a problem in Magic where there are tons of free artifacts, artifact creatures, and even artifact lands