Try to give yourself access to a diversity of removal types, including targeted spells like Blink of an Eye, board wipes like Akromas Vengeance, and exile spells like Angelic Edict in case your opponents cast something indestructible
Weldfast Engineer : Creature (Human Artificer), casting cost of one generic, one black, and one red mana, 3/3
You have to cast your spells precombat, which you dont always want to do, and on top of that, you need both a creature and noncreature
Loxi: Rodolf is cool, but he's a bit expensive and combines two archetypes that might be a bit hard to slap together
Unranked: Rampaging Ursaguana Rampaging Ursaguana is an Alchemy exclusive, and I dont like anything that asks me (or the Arena client) to track something over the whole game