So lets dive into the odds and the math and the likelihood of getting the cards you want
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Many of the best also have a rather low casting cost, allowing them to hit the battlefield early and start generating value
If you do, draw X cards, then you may put a permanent card with mana value X or less from your hand onto the battlefield, where X is the sacrificed creature's mana value
Luckily, creatures such as Satyr Wayfinder and Stitcher's Supplier are efficient means of milling yourself, and can serve as bodies on the board to enable Convoke
This goes doubly so in Commander where your 100 card deck is full of singletons, meaning you're even less likely to draw each card you put inside of it than in other formats