This seems to be because battle damage is the trigger, making active special summoning difficult, and it was eventually reduced to unlimited in the OCG ban in January 2015, just like Goz
But what is really causing this situation
Most instances of explore are found on creature cards, but MTG designers often find clever ways to get the most out of a mechanic, so youll see sorceries that let creatures explore, or vehicles that make the creature crewing them explore
It is very possible they produced the Pokemon Topsun cards in 1995 in preparation to release with Top Seika after Nintendos recommendation
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Engineered Public Confession: The cause of Divine's death