negate the Summon or activation, and if you do, destroy that card.
Sharp Text and Symbols: Authentic cards will have clean text, crisp symbols, and correct set markings
while neither enchantment will stop a single big creature from swinging at you for lethal, Propaganda is quite effective at stopping a Go Wide army from smashing your face, whereas Ever-Watching Threshold does not
Moving forward, opportunities related to Modern are much more likely to involve three specific categories of targets: High demand recovering reprints, eg: LoTV, Tarmogoyf, Snapcaster Mage, Cavern of Souls Recent reprint dodgers, eg: Ancestral Visions, Inkmoth Nexus, Engineered Explosives, Grove of the Burnwillows, Mishras Bauble Newly unlocked/underestimated cards, eg: Rite of Passage, Deaths Shadow, Amulet of Vigor, etc
cards are destined to be deemed overpowered
A brand-new Spell Card that can easily slice through the opponents field like a hot knife through butter