If your deck's key engine is a 4cmc commander like Kaalia of the Vast, for example, then you will want to run ramp cards that can get her out faster, which means ramp that is between 0-2cmc so you can cast Kaalia on turn 3 or earlier instead of her usual turn 4
Green How do I burn in Green and what are the Top Green Burn spells in Commander
Stealing cards directly from your opponent's hand might be the dirtiest form of card advantage in the game
Most of the legends matter stuff is on a handful of underperforming rares though (i.e., Clive's Hideaway, Serah Farron), so dont expect to build around legends specifically
Earlier this year, Wizards of the Coast released a Universes Beyond set called Magic: The Gathering - Lord of the Rings Tales of Middle-earth
You can deliberately usually play to get this trigger off, and a 2/1 with first strike and vigilance and a land fetch (not necessarily a basic) is good enough