Since you're already running at least black and red, you probably have efficient single-target removal to handle that last creature if it does happen to be worth taking out
When he becomes the target of an ability that just targets him you can spend two mana to copy it and then target each other critter you control it could target
considering that one of Arenas main objectives is to ease people into the hobby
That said, it is incredibly unfortunate that theyre still missing one of the most integral parts of any MTG deck: fetch lands
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Multani, Yavimayas Avatar I cant call returning lands to your hand nothing, but I fully expect decks interested in playing Multani, Yavimaya's Avatar to either have a surplus of lands or plenty of effects like Exploration and Burgeoning to get them back in play