When placed on an evasive creature like Spyglass Siren, it allows the player to draw a card each time they deal combat damage
For one-off edge cases, its usually faster to use a generic token, a dry-erase token, or a spare card in a sleeve
When you cast a TDFC, you cast it as the front face, and it enters the battlefield with its front face up. Then each TDFC has further instructions on how you can transform it to its backside.Take Kefka, Court Mage: You spend , and you get to transform it into Kefka, Ruler of Ruin Or Ultimecia, Time Sorceress: Pay and exile eight cards from your graveyard, and she turns into Ultimecia, Omnipotent, giving you a whole extra turn as cherry on top
I like to think that this might be fruit of that work