I thought it would be a fun idea to kill people with a few massive blows from Elemental creatures like Spark Elemental. Give them +X/+X, double strike, fling them and more to abuse their high power the most.

You could for instance play Spark Elemental, Brute Force, Assault Strobe and then Fling to do 18 damage for 5 red mana.

Or Ball Lightning, Rush of Blood, Assault Strobe, Fling to do 36 damage for 9 mana.