You are never forced to activate mana abilities to pay costs, so if there is a mandatory additional mana cost (such as from Thalia, Guardian of Thraben), you can decline to activate mana abilities to pay for it and hence fail to cast the suspended card, leaving it in exile
This guaranteed interest, with the Headliner version listing for around $2,400
It has this weird tension where the draw ability wants you to have a wide board with lots of creatures and equipment, but the equip cheating makes stacking Syr Gwyn with equipment ideal
The comic books, the Funko pops, and action figures are very reasonably priced
For example, a deck that is all Frozen or all Lion King
You don't have to add four copies of each card to your deck though, and sometimes it's beneficial to have fewer copies and make room for other important cards