If you want to the most bang for your buck, Id suggest picking up this precon
Removal suite One of the key points underpinning this deck's construction and viability is that spot removal effects are particularly good in Standard right now

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While Rayas three willpower might seem quite low given the cards cost of six ink, its more than balanced by the Champion of Kumandra ability in its text
Ugins Labyrinth If you build around it, this land may be the most rawly powerful card in the set
Swiftfoot Boots bring the familiar benefits of hexproof and haste