mtg niv mizzet parun commander deck EDH Deck Niv-Mizzet, Visionary 100 Magic Cards Custom Deck Izzet Burn Foundations Flying Whenever you draw a card Niv-Mizzet, Parun - Card Spells

Id like this rogue more if it could get more counters on its own, though it stands as a reasonable threat for 4 mana

If some of the targets are illegal as the triggered ability tries to resolve, the original division of damage still applies, but the damage that would have been dealt to the illegal targets isn't dealt at all

This is a more user friendly version of my Booster Pack Generator which I used to test my own games

The key strength here is on-demand combat damage amplification

Relentless Challenger is going to be a key part of your strategy, as you're always going to be meeting the requirements to buff up your attacks