Dreadful as the Storm

In Commander, Dreadful as the Storm does its best work alongside high-value enters-the-battlefield creatures or recursive threats that reward doubling up — flicker and clone strategies will find it immediately useful. The instant speed is the real selling point at this table size; copying a threat in response to a board wipe or at end of turn before your untap is exactly the kind of flexibility Commander rewards. In Pauper it's legal but competes in a format where three mana at instant speed for a token copy has to fight for space against cheaper tempo options. Legacy and Vintage have access to it but will almost never run it — those formats don't want to spend three mana on a conditional effect that leaves the original creature vulnerable. Oathbreaker is where it can quietly overperform, since copying your planeswalker-supporting creatures compounds loyalty-gain effects fast.