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This is on top of the added effect of preventing your opponent from countering this card's summon

Soul Absorption

Legendary Creature Sliver Eldrazi Rare Justin Cornell 8/8 NOT LEGAL Standard NOT LEGAL Future NOT LEGAL Historic NOT LEGAL Timeless NOT LEGAL Gladiator NOT LEGAL Pioneer NOT LEGAL Explorer NOT LEGAL Modern NOT LEGAL Legacy NOT LEGAL Pauper NOT LEGAL Vintage NOT LEGAL Penny NOT LEGAL Commander NOT LEGAL Oathbreaker NOT LEGAL Standardbrawl NOT LEGAL Brawl NOT LEGAL Alchemy NOT LEGAL Pauper Commander NOT LEGAL Duel NOT LEGAL Oldschool NOT LEGAL Premodern NOT LEGAL Predh Eldrazi you control are Slivers in addition to their other types

The effect reads, you may, so you can choose whether to play them

So, who did I miss or overrate

It requires a defending opponent to sacrifice as many permanents as indicated with the ability when attacked