Branded-Iron, Spell Scale

You have no maximum hand size.
Drakes and Dragons you control have cascade.
If you control 4 or more creatures with power
5 or greater, you may cast mana as if it were any color.
{t}{r}{u}{u/r}{u/r}{b/g}: Draw 3 cards, an opponent
randomly picks 1. Each opponent takes damage
equal to the converted mana cost of the card,
then draws 2 cards.