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What are the weaknesses and retreat cost of this Phantump card

In actuality, it's kind of just a tame spell-copying creature, slightly worse than Dualcaster Mage, though legendary and eligible for the command zone

Instead, it results in that many -1/-1 counters being put on that creature or that many poison counters being given to that player

You know what else costs a million mana besides Arvinox and Herald

You can use it as a base to expand upon and come up with your own lists or take advantage of cards you already own

Really I just see this as a combo piece and so it is somewhat narrow, it is not even that powerful compared to many of the possible targets, and certainly not for its mana cost, it is just so highly convenient for combo