mtg card kingdom Themberchaud | Secret Lair Trample Whenever a land card is put into your graveyard from anywhere Card Kingdom says this is

This includes many zero mana artifacts such as Jeweled Lotus and Lotus Petal, as well as spells with free alternate costs such as Deflecting Swat and Fierce Guardianship, since they do not require mana to cast when the criterion to cast them for free is met

Thats a bit less, right

Trapeze Artist Animate Object Astroquarium Baaallerina Bag Check Bamboozling Beeble Bioluminary Blufferfish Boing

When you cast a noncreature spell, you can pay X life, where X is equal to the mana value of that spell

There are also sketches he made while finalizing the design

If a permanent is copying a melded permanent, the converted mana cost of the copy is 0