If you have any sacrifice outlet in play, such as Phyrexian Altar, you can then generate card advantage by sacrificing opposing creatures
If the target opponent is an illegal target as Tataru Taru's first ability tries to resolve, it won't resolve and none of its effects will happen
Its exceedingly rare for a Commander deck to get a cycle of brand new cards, and I think they hit it out of the park with this one
But know, it's a great card due to its versatility
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even though that mana is restricted to casting your commander, its still the Commander equivalent of a Black Lotus, the most sought-after card in Magic history (well, except for The One Ring)