Variety of free starter decks
If Gogo copies a legendary creature, Gogo will also be legendary, but because its name remains Gogo, Mysterious Mime, the "legend rule" won't cause either of them to be put into the graveyard
Cards that are much more interesting for this deck are the good control planeswalkers such as Gideon Jura, Wrath of God assuming you have failed to get enough spot removal, big threats that dominate the board such as Simic Skyswallower, Elesh Norn, Frost Titan and any other cheap disruption that ideally maintains card numbers such as Remand
In my environment, sweepers are more prevalent than targeted removal
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Since I haven't allocated enough space for disruption, if you want to pursue a more competitive feel, refer to the update suggestions above and add some low-cost cards that can interfere with your opponents