Cheapest priced copy (Tarkir: Dragonstorm): $0.99 at Card Kingdom, near mint, their price list as of .
Shiko, Paragon of the Way 
Legendary Creature — Spirit Dragon · 4/5 · Mythic · Tarkir: Dragonstorm · #370
Flying, vigilance
When Shiko enters, exile target nonland card with mana value 3 or less from your graveyard. Copy it, then you may cast the copy without paying its mana cost. (A copy of a permanent spell becomes a token.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
5 printings · $0.99 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Promos | 223p | Mythic | $1.29 | $1.49 |
| Tarkir: Dragonstorm Promos | 223s | Mythic | — | $2.49 |
| Tarkir: Dragonstorm | 223 | Mythic | $0.99 | $0.99 |
| Tarkir: Dragonstorm | 317 | Mythic | $3.49 | $12.99 |
| Tarkir: Dragonstorm | 370 | Mythic | $5.49 | $4.99 |
6 rulings from Wizards of the Coast
- 4 April 2025A resolving copy of a permanent spell becomes a token. That token isn’t “created” and won’t interact with abilities that care about tokens being created.
- 4 April 2025If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
- 4 April 2025If you don’t want to cast the copy, you can choose not to; the copy ceases to exist the next time state-based actions are checked.
- 4 April 2025If you cast a spell “without paying its mana cost,” you can’t choose to cast it for any alternative costs. You can, however, pay additional costs, such as kicker costs. If the spell has any mandatory additional costs, those must be paid to cast the spell.
- 4 April 2025You cast the copy while Shiko’s last ability is resolving and still on the stack. You can’t wait to cast it later in the turn.
- 4 April 2025If the spell you cast has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.