If multiple creatures enter at the same time, evolve may trigger multiple times, although the stat comparison will take place each time one of those abilities tries to resolve
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You might consider Harsh Mentor a stax piece, since it puts an artificial limitation on how many times a certain action can be taken
Some cards specify other ways to win or lose the game
There isnt a way to profitably interact with a blitz mechanic coming your way aside from exiling, so its almost like cycling a card and doing some damage
While eight mana is a lot, you can cut it down to just two blue mana with the delve ability, making it much more manageable, especially earlier in a game