Cheapest priced copy (The List): $0.99 at Card Kingdom, near mint, their price list as of .
Elspeth, Undaunted Hero 
Legendary Planeswalker — Elspeth · Mythic · The List · #THB-270
+2: Put a +1/+1 counter on each of up to two target creatures.
−2: Search your library and/or graveyard for a card named Sunlit Hoplite and put it onto the battlefield. If you search your library this way, shuffle.
−8: Until end of turn, creatures you control gain flying and get +X/+X, where X is your devotion to white.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The List | THB-270 | Mythic | $0.99 | — |
| Theros Beyond Death | 270 | Mythic | $0.99 | $0.99 |
7 rulings from Wizards of the Coast
- 24 January 2020The value of X is determined only as Elspeth’s last ability resolves. Once that happens, the value of X won’t change later in the turn even if your devotion to white changes.
- 24 January 2020Elspeth’s last ability affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn won’t get +X/+X or gain flying.
- 24 January 2020Mana symbols in the text boxes of permanents you control don’t count toward your devotion to any color.
- 24 January 2020Colorless and generic mana symbols ({C}, {0}, {1}, {2}, {X}, and so on) in mana costs of permanents you control don’t count toward your devotion to any color.
- 24 January 2020Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).
- 24 January 2020If an activated ability or triggered ability has an effect that depends on your devotion to a color, you count the number of mana symbols of that color among the mana costs of permanents you control as the ability resolves. The permanent with that ability will be counted if it’s still on the battlefield at that time.
- 24 January 2020If you put an Aura on an opponent’s permanent, you still control the Aura, and mana symbols in its mana cost count towards your devotion.