When an effect suspects a creature, it becomes suspected
Add in the ability to fuel graveyards, generate mana and card advantage, serve up plenty of loyalty to flashback Light up the Night, and so, so many other applications and you might not just be looking at the best card in Innistrad: Midnight Hunt this might be the best card in Standard
How about a 4/4 wall that can attack if the opponent controls Islands, and cycles to boot
This combo is meant to be played on multiple turns, as Demonic Pact requires the player who controls it to choose one of four different options, one of which reads "You lose the game." What follows is that players need Harmless Offering to cede control of Demonic Pact, but only after the first three options have been used in order to have the opposing player get the Enchantment with no other option but to lose the game at the start of their turn
Id say dont hesitate to snap these off under $10
You are locking yourself down somewhat early for fairly little payoff