If they try to play Monsters in Defense Position, Red Dragon Archfiend can destroy them all by attacking once
The game tries to avert this with its special heroes (Legendary, Mythic, Ascended, Rearmed, etc.), which are intentionally made more powerful than regular units and are usually based on the endgame promoted versions of the characters in question
Play the Diabell X SPELL Quick-Play If a Spell/Trap(s) is sent to the GY to activate a card or effect: Send 1 Illusion or Spellcaster monster from your hand, Deck, or Extra Deck to the GY
Casual players have a great alternate win condition in Liliana's Contract, while Liliana's Defeat is an exceptional sideboard card in black-heavy metas
Flameskull Maybe it's simply a lifelong love of skeletons that endears Flameskull to me so much, or that the monster's look straddles the uncanny valley between spooky and derpy
UPC box coverage