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This turns looting effects, rummage spells, and self-discard engines into a steady stream of oversized threats , letting you convert every creature in your hand into battlefield value

When that land dies or is exiled, it isn't a creature anymore, but it comes back to serve its original purpose as a land

A thorough examination of the card (and Merfolk in general) can be found here

Part of this is due to flashback letting you use it twice, and part of it is the political angle for Commander: You can put counters on other players permanents to strike deals or maybe enhance cards like Generous Patron and Nils, Discipline Enforcer