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It has an instant kill mechanic and makes your assassin cards cheaper to play

This is likely to be most applicable to Commander, so I'll focus on that aspect

The alternative was to burn five sideboard slots on useless cards, and that obviously was not a good answer

The answer depends entirely on what you value most

Deserts are very rarely playable outside of filling in Limited decks, but there are still a few Id consider budget-playable in formats like Commander where land utility is great and fixing is king

Every deck that can run it, SHOULD run it, as the card is simple, incredibly effective, and allows you to get your game plan moving before your opponents can even react