Whenever an opponent loses life for the first time during each of their turns, put a +1/+1 counter on Valgavoth, Harrower of Souls and draw a card
Nevertheless, cards that can repeatedly sacrifice creatures are commonly referred to as sac outlets, and they usually do this for little to no other costs
Cards like Pixie Guide, Krark's Other Thumb, and Bamboozling Beeble have similar effects
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Like most Magic: The Gathering cards, the value of Kaya the Inexorable depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Kaldheim)
People are generally fine with Expropriate from a power level perspective, even if many find it boring, but I think a plurality of decks that are power level 7 and up eschew big mana stuff because they don't need it, if you can win with Rite of the Raging Storm then you don't need Expropriate