dido pokemon card Ditto Price & Details — XY Black Star Promos 201/091 Category Cards with Ditto | Pikawiz

Instead of paying the full mana cost, you could put a lot of cards in your graveyard (which many competitive decks tend to do) and pay the minimal cost for each of them

While I dont value the Mimic as highly, the ability to recover from board wipes but discarding lands to copy [casthaven]Spitting Image[/casthaven] out of my graveyard was secretly awesome

First Flight (White-Blue)

Then later, the flashback lets you go bigger since you can grab a real haymaker like Parhelion II and turn one card into a serious late-game swing

Today, some of those same cards remain the most valuable, but their price increased by multiple orders of magnitude