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
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
An ultimate treasure, one ring to rule them all
All is well
Goblin Ringleader wants to make sure that you flip over as many Goblins as possible when you cast it
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