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Like most Pokmon cards, the value of Ditto 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 (Detective Pikachu)

Second, Korvold can be your Jund commander, and a fairly powerful one at that

Discard as many [M] Energy attached to this Pokemon as you like

Even better, it has the Hideaway ability, letting you dig five cards deep into your deck and tuck away a spell, ready to cast it for free later when you meet a particular criteria: in this case, having three creatures with different powers after you tap Collector's Cage