The creature you return must be tapped at the time you pay costs, but doesn't necessarily need to be tapped before you start casting the spell
In the past, Disinformation Campaign would mostly annoy the opponent by stripping their hand of cards but wouldn't actually win us the game
Head of the Class would fit best in an Orzhov (whiteblack) spellsmatter or heroicstyle deck that plays a high density of cheap instants and sorceries that target creaturessuch as protection spells, pump spells, or removal that can target your own creatureso you consistently trigger Repartee while also discounting a key spell each turn
After Frodo becomes a Scout, the player can pay black mana to turn Frodo into a Rogue who can hear the Ring's temptation many times
If we compare it to another mythic from Modern Horizons, Wrenn and Six is still a $50 card despite having arguably narrower applications in Modern and being banned in Legacy
Kami of Transience is quite a vision, a four-legged tree spirit with a collection of masks and vividly red leaves