My favorite double-faced villain is Ultimecia, Time Sorceress, which has an ability we'd normally never put at uncommon, especially on a creature: an extra-turn effect
Dietitians Revive didn't specify how difficult this deck is to play
Mew VMAX SA (128,000 / ~$908) commands a premium for three reasons: (1) the AKIRA EGAWA illustration is widely considered one of the most visually striking SA cards of the Sword & Shield era, (2) Mew VMAX was the centerpiece of the dominant Fusion Strike competitive archetype, cementing its place in TCG history, and (3) the pull rate (~1/16 boxes) keeps individual card supply scarce even years after release
Alloy Animist At just 1 mana, Alloy Animist is one of the cheapest and most repeatable ways to turn artifacts into deadly creatures
5 Forbidden Droplet Players that like to negate opponents' monsters' effects, halve their attacks, and generally switch the flow of the game mid-turn will enjoy using Forbidden Droplet