One card with this effect is the Sadistic Sacrament, which is expensive in terms of mana, and so it tends to be played too late in the game to have a strong effect
As their controversial appearance may suggest, these cards are surprisingly difficult to come by
The Double Masters 2022 printing, for example, has spiked up to $41.78, not including shipping
(2023-11-10) If your Commander deck has two commanders, you can only include cards whose own color identities are also found in your commanders' combined color identities
Basically, if I can't get Eldrazi working with what we have now I shouldn't really bother until we revisit an Eldrazi plane
When I refer to "best" in these lists, I'm talking about cards that have an iconic place in Magic's history, cards that are currently seeing a good amount of play, or cards that were notable at some point in the past