This is potentially the Oko, the Trickster of Streets of New Capenna, justifying its price and its two different positions on this list
Thief's Knife also makes non-rogues go rogue
though of course theres generally nothing stopping you from using these cards in your deck, you wouldnt expect to see cards from these boosters in the wild, as theyre generally just variants of existing cards that are much cheaper to acquire, and intended for repeated handling
The efficient mana cost makes it very easy to cast Activated Sleeper after a board wipe to get a copy of the best creature that died or use it to pull off other tricks
Lorehold Spirit (RW): Leverage your graveyard to summon Spirits and grow your army with powerful synergies
Reactivity doesnt necessarily mean preparation: you can frame it as opportunistic, in the way that more villains should just be shot while monologuing