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If one or more other creatures you control die at the same time that Elas il -Kor dies, its last ability triggers for each of those other creatures
So its no wonder this particular card sells for so much, with a current average selling price of $3,530
(To mill two cards, a player puts the top two cards of their library into their graveyard.) The card you put on top of your library, if any, may be one you just milled, or it can be one that was already in your graveyard
Its not Brias fault theres a better card doing what it does, but the otter legend holds its own quite well, turning all your spells into mass board pumps, similar to Balmor, Battlemage Captain