You dont tap Imskir to activate it, meaning you can go more than once in a turn if you have the mana to do so
(Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) Instant Shriekmaw Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) When this creature enters, destroy target nonartifact, nonblack creature
And this isn't some small creature with a cool ability
Either that, or they played on Anya's (a character from Buffy the Vampire Slayer ) number one fear
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While she costs only three mana one red, one green, and one of any color because her saga sides final effect generates 10 mana spread evenly across all five of Magics colors, her color identity is also all five