Protection has already been used
It lets you counter things that most spells cant touch, like cascade triggers or colorless bombs
(2020-04-17) Before shuffling your deck to become your library, you may reveal one card from outside the game to be your companion if your starting deck meets the requirements of the companion ability
One thing we've seen over the past year of Standard is that the combination of cheap removal and heavily played planeswalkers that incidentally answer creatures (basically every Teferi, Oko, Thief of Crowns, etc.) makes it difficult to build around cards like Captain Sisay
It provides a 2/1 creature, an artifact, and a reliable source of ping damage to boot
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