Well, [c]Ox of Agonas[/c] is one of them
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This is, by the way, so far the only vanilla Un creature
The additional mode you choose can't be the same as one you're already choosing with that spell unless that spell allows you to choose the same mode more than once
The one-two punch of a mana accelerant, which the archetype craves, and a copy ability puts a disgusting amount of pressure on your opponents
Whether duplicating an opponents massive threat or transforming into a new utility creature every turn, Vesuvan Doppelganger became a staple in early MTG formats and remains a sought-after card for both collectors and players alike