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But you can definitely run without it too

The cards opened here are just an example

The Human has morph and can be morphed later, although I doubt you'll want to do that since you'll be spending four mana instead of just three and it's the only morph card in the deck

It was reprinted in a Commander set, but it is way too costly to see much play

In a Limited environment where everyone is playing morph creatures and the average size of most creatures is about a 2/2 anyway, having a creature that morphs into a 3/4 without paying any mana whenever you feel like it ends up being a huge blowout

You may do this even if that player has no nonland cards in hand, or even no cards at all