You can start playing immediately after purchase
The key thing to build around is the other than your hand line, so cards with foretell (Behold the Multiverse, Delayed Blast Fireball) and flashback (Think Twice, Galvanic Iteration) are excellent
Either way, in a dedicated food or squirrels deck its pretty decent, especially if you exile your own mana dork
This means that if your opponent has evolved Charmander into Charizard using Rare Candy, you'll send the Charizard card back to their hand while defeating Charmander with the 100 damage from the attack
Perhaps leans into the theory of originating from employees
This is important because if you were to choose the targets for spells when you suspended them, those creatures/players/spells may not be legal targets X turns later when the spell is cast and it would just fizzle