Walkers are almost all about their first ability however and any four mana walker that makes tokens while growing is a serious problem for most decks, things will escalate out of control fast and so they need answering shortly
But in general, running out of spells is the best way to lose at Limited so, as odd as it sounds, I would regard Clattering Augur, Echoing Return, Gilt-Blade Prowler and Greed as perhaps the most indispensable cards for this archetype if you arent splashing
Archimedes - Electrified Owl is a fairly straightforward card that just happens to stack several great abilities
This helped with the simplicity of the rules and gameplay for beginners looking to play MTG
God-Eternal Oketra Just imagine for a moment how many creatures the typical White deck will cast over the course of a duel
A few things jumped out as I compiled this list