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Furious Sea King

Ink-Eyes, Servant of Oni (BLC) $15.49 Another of the Imagine: Courageous Critters cards, Ink-Eyes, Servant of Oni has had plenty of reprints over the years but manages to keep a good price tag

The other option is to take advantage of the direct damage, which is good in its own right to either finish off a damaged character or get them within range to be banished but also works with the likes of cards that benefit from being damaged - such as Scroop, Backstabber - that benefit from healing damage, like Rapunzel, Gifted Artist, or from damage being dealt: like Beast, Relentless.

So, why would anyone want to play Stax in Commander

They only purchase modern cards

Card draw matters especially in Mono-Blue because your interaction pieces are often fairly specific