Think of it like using Act of Treason to grab a creature, attacking with it, and then tossing it into something like Goblin Bombardment or Deadly Dispute
For three mana, while this Human's toughness is statically four, its power is equal to the number of creatures under its owner's control
Put a +1/+1 counter on this creature for each creature card exiled this way
Once you have Flareon ex powered up, you can start dealing massive damage with Fire Spin
I do like that even though the artwork of these classic designs are updated, they're at least trying to homage the original depiction
(If a creature with a finality counter on it would die, exile it instead.) Flashback (You may cast this card from your graveyard for its flashback cost