The other Gearhulk cards are also pretty valuable out of the gate: Riptide Gearhulk and Oildeep Gearhulk are also in the $9-$10 range
7 Fleet Swallower Not all cards in a mill deck need to be a sorcery or instant
(They're artifacts with ", , Sacrifice this token: You gain 3 life.") Sacrifice three Foods: Return this card from your graveyard to the battlefield
When Zodiark is summoned, each player sacrifices half their creatures (rounded down), and for every being sacrificed in this way, Zodiark gets a +1/+1 counter
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Slickshot Show-Off is a staple of many red decks in Standard, Pioneer, and Modern