I knew that I was going to play with Chandra in some capacity (duh), but the question was where
basically, at the end of the duel, sacrifice your master of oz and blue-eyes ultimate dragon to add their attack points to gate guardian, and your attack will reach a whopping 12450 attack
If it pops your Gaia, re-establish another one on your next turn with Loading
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)
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
Second, Korvold can be your Jund commander, and a fairly powerful one at that