You can only ever sacrifice permanents that you control
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Threads of Disloyalty If youre unfamiliar with Threads of Disloyalty, or are even think about writing this card off, just go watch Shaun McLarens run in the Top 8 of Pro Tour Born of the Gods
Loyal Warhound Loyal Warhound has a lot in common with Knight of the White Orchid its a solid attacker with some catch-up ramp stapled on
It's a removal spell dedicated to lifegain decks, the same way you might consider Drag to the Roots in a dedicated delirium deck
Im sure there are even more options that I havent explored myself, but this should give new shoppers ample products to browse
