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Glimmers of characters swept up in the chaotic flood find themselves transformed in surprising ways, while precious lore is washed out into the Inklands far below

[On Play] You may rest this Character: Play up to 1 green Character card with a cost of 5 from your hand

Basically this can be considered much like some redundancy for Young Pyromancer

Although vulnerable to good spot and mass removal the EtB effect of Atarka means you are still pretty ahead if they do remove it

Because Lazav isn't entering the battlefield when it becomes a copy of a card, any "When [this creature] enters the battlefield" or "[This creature] enters the battlefield with" abilities of the copied card won't apply

One of the things that impressed me most about this game is that its founder was a professor of mathematics