This will either grant you card draw or turn into a Ruric Thar effect that doesnt affect you
First introduced in Wilds of Eldraine, the Adventure mechanic allows players to cast the Adventure half of a card, then later cast the other half from exile once the Adventure resolves
Additionally, there are parallel versions of the cards included in the bonus pack
Both Illusionary Forces and Illusionary Presence has cumulative upkeep, and so are most of the cards directly with 'illusion' in their name
For example, Terror of the Peaks was the first card I slotted into the 99
For some, that nostalgia has never faded, and they're willing to fork over some cold, hard cash for the missing cards in their collectors' decks