Borborygmos and Fblthp, Indominus Rex, Alpha, and Jadzi, Oracle of Arcavios all fit the bill
Because mean mechanics usually rely on old, weird enablers
Like most Magic: The Gathering cards, the value of Squid Fire Knight depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Unfinity Sticker Sheets)
Crucible of Fire gives a static +3/+3 boost to all Dragons, Thrakkus the Butcher doubles Dragons' power when they attack, and Gratuitous Violence doubles all damage dealt by your creatures
But with threshold activated (seven or more cards in your graveyard), that boosts up to three damage
This puts it practically on par with Lightning Bolt, though losing the instant speed timing and being only able to target your opponent really does a lot to diminish the power of the card