Centaur Warrunner + Mars

Why this works

Locking enemies in Arena of Blood is the whole point of Mars, but it directly conflicts with what Centaur Warrunner wants to do with Stampede. You can’t run people down across the map when they’re stuck inside a small circle. This core tension makes teamfights awkward. Beyond that, both heroes essentially fill the same role as a durable, Blink Dagger initiator. Having both on a team often means they compete for farm to hit similar item timings. Your draft gets two frontliners who want to do the same job, but you might end up lacking the sustained damage or lockdown diversity needed to secure kills after the initial jump.