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That is the whole evidence chain

Its also a fairly good card

Explore by itself is a ton of value -- you guarantee your next land drops and are buffing your army -- but it's especially good here due to synergy potential with +1/+1 counter payoffs (Tributary Instructor) and graveyard payoffs (Deeproot Historian)

If that dragon didn't see us before, it can certainly see us now

Set 1 Super Polymerization from your Deck, also, until the end of your opponents turn, you cannot Special Summon, except HERO monsters, but you can Fusion Summon Fusion Monsters that must be Special Summoned with Dark Fusion, with effects other than it