However, in cEDH
while neither uses the tap symbol, they both have the type 'Mono Artifact' which by the rules of the time meant that they were tapped as part of their usage (and thus could only be used once in a turn)
7 Lightning Energy: Emerald (Holo Rare, 104) $13.50 Technical And Electrical Emerald is an expansion that came out near the release of its game counterpart and, just like the game itself, this expansion is one of the best in the series
That alone would be completely unfair, letting you use their resources to maybe Catcher stall them, using their Energies, etc
Sunfall A five mana exile-all-creatures spell is not terribly overcosted, and it has the upside of making a big-ol' token that becomes a creature for two mana whenever you want
Its also worth remembering that core sets tend to be defined by a couple of high end reprint anchors-the sort of gee-wiz inclusions that are designed to entice established players into buying a box of a set that they might otherwise skip