Chandra, Heart of Fire Chandra, Heart of Fire is interesting specifically because of its synergy potential on the +1 ability
One of the cards sold for $233,000 this July, making it the most expensive sale of a single card on record
Varolz, the Scar-Striped Varolz, the Scar-Striped is a graveyard commander that wants to use your dead creatures to buff your living creatures rather than reanimate them
Looking for Piplup prices and values
Whispers of the Muse (T1, Ext, S, Block) A favorite in "Turbo Xerox" (a blue deck which used minimal land but a ton of cantrips to thin out the deck), Counter-Phoenix (Shard Phoenix + Forbid) and Tradewind-Awakening (put Awakening on the stack, tap all your lands for mana, untap all your lands), Whispers has what might seem like a hefty price to pay for one card but you get to do it turn after turn after turn
But as it is one of the most popular franchises in the world, there are some cards whose values have increased exponentially over the years