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As far as sweepers go, in a Gruul, Izzet, or mono-red deck, this is a great option, but since we're in Mardu, we can be a little pickier with our mass removal spells
Add 1 level 6 Digimon card with [Machine] in its traits among them to your hand
When the last is removed, you may cast it without paying its mana cost.) Sorcery Rousing Refrain Add for each card in target opponent's hand
Pretty handy, right
You can only use this effect of "Mimesis Elephant" once per turn