The color combination and Killian let you focus on one key attacker and gives you lots of options for combat
This allows you to supercharge the value of creatures like Taborax, Hope's Demise and recycle enter the battlefield triggers of cards like Soul Warden
There is one more archetype that steel enables, which I briefly mentioned in the emerald section above Mill
While a few, like Reassembling Skeleton and Skeleton Crew are excellent combo enablers, Zombies have so many more options and so much more support that they should be the meat of your creatures if you lean into a type
In the first few turns, I figure getting a Lander token is better than drawing a card, but then Landers start to drop off in value, massively dropping later game
But Battles can be attacked