Cheapest priced copy (The Lost Caverns of Ixalan Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Tishana, Voice of Thunder 
Legendary Creature — Merfolk Shaman · */* · Mythic · Ixalan · #230
Tishana's power and toughness are each equal to the number of cards in your hand.
You have no maximum hand size.
When Tishana enters, draw a card for each creature you control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.99 to $20.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan Commander | 291 | Mythic | $0.99 | — |
| Ixalan Promos | 230s | Mythic | — | $20.99Out of stock |
| Ixalan | 230 | Mythic | $1.49 | $7.99Out of stock |
3 rulings from Wizards of the Coast
- 29 September 2017If Tishana enters the battlefield while you have no cards in hand, it will be put into your graveyard for having 0 toughness before its triggered ability resolves.
- 29 September 2017Because damage remains marked on a creature until it's removed as the turn ends, the damage Tishana takes during combat may become lethal if cards leave your hand later in the turn, such as by casting them in your postcombat main phase.
- 29 September 2017The number of creatures you control is counted only as Tishana's last ability resolves. If Tishana is still on the battlefield, it'll count itself.