On the topic, you could run Blim, Comedic Genius (though he needs decent support such as liches).

Akroan Horse?

There are also at least a few auras that buff creatures (yours or opponents), don't have goad but do have 'this creature can't attack you' clause.

If you had both Fumiko the Lowblood and Ghostly Prison on the board, the end result would be that your opponents not being forced to attack.

They would just choose you as the player their attacking then not pay into Ghostly Prison, since Fumiko or even goad, can't force them to.

Deck link?

I'd cut 2-3 lands for ramp such as Rampant Growth and Cultivate.

Find room for Simic Ascendancy. Growth counters and a Mana sink will help even if you don't hit the win-con often.

I'd take out Juniper Order Ranger. His cost is a bit high and you have cheaper and abundant ways to get counters on creatures (such as soon to be included (Innkeeper's Talent).

You have 36 (now 37?) noncreature spells which is plenty to justify Flux Channeler.

If you still wanted to improve past that, I would look at your planeswalkers package. Seems there could be more heft (I tend to be degenerate with mine) but if they suit you well, ignore this comment because that's probably just your play style.