Thanks for the suggestion. While the initial idea of the deck was to recur
Trial of Ambition, I think there are multiple possible ways to do it and multiple possible Trials that could be viable. In particular, I chose black both because
Trial of Ambition is cheap and because Yahenni can be made indestructible. The indestructible Yahenni prevents about half the removal/wipes in this Standard from 2-for-1ing a Cartouche. Ideally I'd go green for hexproof, actually, which might be an idea but UG Pummeler is a far better optimized deck. Abzan might work really well though... I'll have to try it. Going red is a more RW weenie approach. Hard to say if it's usable, I'd want to try both though. Hazoret would be one card I'd definitely add if the deck contained red.