If that card is no longer in your hand when Don't Worry About It tries to resolve, it won't resolve
The first 10 batches of 6-Pack Hourglasses are going to be cheaper for you, being only 12 tickets, so pick these up as soon as possible
Its totally possible to have just one daybound/nightbound creature in your Modern or Legacy deck, where the time of day may feel like a bit of extra text on that one card
Jolteon is a particular standout that is actually used in top non-standard decks, able to completely negate damage from basic Pokemon for a turn
Youll also have access to white, which will give you more versatile removal and protection
Normal Summon can't be done, but excluding 2 GY dinosaurs to expand and light summoning conditions