Still, once it resolves, you can choose how to kill your opponent slowly by either casting spells from the top of their library without paying mana, shrinking their hand, killing their creatures, and, if they've survived long enough, exiling all their non-land permanents with the ultimate
Each ability takes into consideration the other Mountains that entered at the same time as the one that caused it to trigger
I'm leaving it out for now, but I'll look down here if I ever can't find other good options
It scales very well with removal effects, say an Outpost Siege in dragons mode
Heartfire Hero Unlike Cacophony Scamp or Fireblade Charger, Heartfire Hero hits each opponent, which feels like a must-include in the crowded Boros equipment EDH space
This opens a modal with your full collection, showing counts per collection file, mana costs, and rarity indicators