Cheapest priced copy (Commander 2021): $0.99 at Card Kingdom, foil, near mint, their price list as of .
Zaffai, Thunder Conductor 
Legendary Creature — Human Shaman · 1/4 · Mythic · Commander 2021 · #331
Magecraft — Whenever you cast or copy an instant or sorcery spell, scry 1. If that spell's mana value is 5 or greater, create a 4/4 blue and red Elemental creature token. If that spell's mana value is 10 or greater, Zaffai deals 10 damage to an opponent chosen at random.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.99 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2021 | 4 | Mythic | — | $0.99 |
| Commander 2021 | 331 | Mythic | $3.49 | — |
| Commander 2021 Display Commanders | 4 | Mythic | — | — |
8 rulings from Wizards of the Coast
- 16 April 2021"That spell's mana value" refers to the spell that caused the ability to trigger, not the card you look at when you scry.
- 16 April 2021If an effect creates a copy of an instant or sorcery spell, this will also cause the magecraft ability to trigger.
- 16 April 2021For example, if you control Archmage Emeritus and cast an instant or sorcery spell, Archmage Emeritus's magecraft ability will trigger and you will draw a card.
- 16 April 2021If the instant or sorcery spell has {X} in its mana cost, X is the value chosen for X as the spell was cast.
- 16 April 2021Some effects instruct you to copy an instant or sorcery card in a zone other than the stack. These copies do not cause magecraft abilities to trigger. However, most effects that do this also allow you to cast the copy, and casting the copy will cause magecraft abilities to trigger.
- 16 April 2021If an effect creates multiple copies of an instant or sorcery spell, magecraft abilities trigger once for each copy created by the effect.
- 16 April 2021Each magecraft ability has a different effect, although they all have the same trigger condition, whenever you cast or copy an instant or sorcery spell.
- 16 April 2021The wrong card name was inadvertently included in Zaffai's printed rules text. The text above is correct and the full name of the card is Zaffai, Thunder Conductor.