For two mana, Expressive Iteration allows you to dig for a key spell and a land, just so long as you havent played a land for the turn yet
The same cant be said for Wildsear, Scouring Maw
With our strategy build upon Ally EtB effects/triggers we need ways to multiply that triggers or cards that care about EtB
Forcefield ($600) Forcefield is a card that can find some use to keep you alive, particularly against big creatures swinging at you

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Seek effects provide more specific draw, allowing Alchemy players to find what they need rather than just randomly top-decking