Cheapest priced copy (Masters 25): $0.35 at Card Kingdom, near mint, their price list as of .
Wildheart Invoker 
Creature — Elf Shaman · 4/3 · Common · Foundations · #561
{8}: Target creature gets +5/+5 and gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
8 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 194 | Common | $0.35 | $0.49 |
| Commander Legends | 263 | Common | $0.35 | $0.49 |
| Duel Decks: Zendikar vs. Eldrazi | 26 | Common | $0.35 | — |
| Duel Decks: Elves vs. Inventors | 26 | Common | $0.35 | — |
| Foundations | 561 | Common | $0.35 | — |
| Jumpstart | 444 | Common | $0.35 | — |
| The List | DDU-26 | Common | — | — |
| Rise of the Eldrazi | 213 | Common | $0.35 | $0.49 |