arceus pokemon card holo - AR3 Rare Colorless Lightning Turn (30) Switch Arceus with 1 of your Benched Pokémon Arceus - 008/017 (008/017) —

These are the free sacrifice outlets in this deck: Altar of Dementia Carrion Feeder Cartel Aristocrat Spawning Pit Viscera Seer Priest of Forgotten Gods (must tap Priest of Forgotten Gods but should probably be done at sorcery speed unless you have an instant to use with the 2 extra black mana the ability will give you) While these are probably your best targets to sacrifice a creature, there are a couple more

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Ragavan, Nimble Pilferer [c]Ragavan[/c] is one of the most powerful one-cost creatures in MTG

Playing this on turn one seems pretty sweet, since it's a very hard to block creature in the early game thanks to First Strike and Deathtouch