Aragorn, The Uniter or Sauron, the Dark Lord are powerful and flavorful cards, but RGWU and 3UBR are pretty intense mana costs for a format as powerful Modern or Historic
With how quickly you can amass a large and wide battlefield, you can start getting in for damage before your opponents have a chance to set up
There will be some ramp decks that can make it work
Energy Charge (Pokemon Japanese Gold, Silver, New World | Pokemon Cards) prices are based on the historic sales
Boldwyr Intimidator Cowards cant block warriors is a bit of a meme in the Magic community at this point, and it has shown up on multiple cards
Another aspect of Explosives playability is that it is specifically the CMC you blow up not everything upto it as well which means you can afford to play the card in a deck aiming to develop a board