Minamo Better than rebounding instants and sorceries, by far, is drawing cards for everything you cast
Krark, the Thumbless can be a no-cost way to copy your spells and a huge benefit with just one coin flip win
Therefore, it shouldnt be a surprise that a commander that gives you card advantage from ramping is on this list
The only downside is that it's a 5 mana commander without inbuilt protection or haste
While Mill X cards like Wall of Lost Thoughts will churn through four cards for two mana, which isnt a terrible mana to mill ratio, without top deck knowledge theres no way of knowing what exactly youre putting in your graveyard
Being able to hold up interaction or the option to see more cards has always been good in Commander, and its why Mystic Confluence sees so much play