Quote from Tears of Tomorrow »
And speaking of Dominaria, Haunt of Hightower is another attack-to-make discard for 6 mana: I'm not a fan of those.
NB that unlike Dominaria's Urgoros, The Haunt of Hightower doesn't need to connect to make op discard - it's just an attack trigger. I'm not saying that makes it amazing, but it's definitely way better, and if there's some discard synergy, who knows?
Also, I can't wait to build Temur Cantrips.