What's the play?

Greetings, fellow affinity players!

Earlier, I was playing a match versus a Grixis Shadow player on Xmage, and I found myself in an interesting spot where I'm not quite sure what the best play was.

Here's the spot: http://imgur.com/a/vCK9r

So, what would you guys do here? What do you think is the safest play that guarantees a two turn clock?

Context: We were 1-1 and, by the way he played earlier turns, I was fairly certain he couldn't have two 1 mana removal spells, however, a single mana removal spell or even a Kommand were on my radar.