Witch-king, Bringer of Ruin Witch-king, Bringer of Ruins attack trigger can do a good job removing threats from your opponents boards
Thirsting Axe: The downside is really restrictive and I am not sure it is worth it, unless you meant to sacrific the creature anyway.
Excellent at on-battlefield assessments and attacking/blocking
Its controller searches their library for a basic land card, puts it onto the battlefield tapped with a stun counter on it, then shuffles
Urza-Tron is notorious for amassing seven colorless mana by as early as turn three, since Tower taps for three and Mine/Power Plant tap for two
While the Zodiac Horse has its niche, it may not see widespread play due to the availability of more versatile or powerful creatures in the current meta