Cheapest priced copy (Bloomburrow): $0.35 at Card Kingdom, near mint, their price list as of .
Wax-Wane Witness 
Creature — Bat Cleric · 2/4 · Common · Bloomburrow · #39
Flying, vigilance
Whenever you gain or lose life during your turn, this creature gets +1/+0 until end of turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Bloomburrow | 39 | Common | $0.35 | $0.49 |
4 rulings from Wizards of the Coast
- 26 July 2024If you gain or lose an amount of life “for each” of something, that life is gained or lost as one event and Wax-Wane Witness’s last ability triggers only once.
- 26 July 2024In a Two-Headed Giant game, life gained by your teammate won’t cause Wax-Wane Witness’s last ability to trigger even though it caused your team’s life total to increase.
- 26 July 2024Wax-Wane Witness’s last ability triggers just once for each life-gaining or life-losing event, no matter how much life was gained or lost.
- 26 July 2024Each creature with lifelink dealing combat damage causes a separate life-gaining event. For example, if two creatures you control with lifelink deal combat damage at the same time, Wax-Wane Witness’s last ability will trigger twice. However, if a single creature you control with lifelink deals combat damage to multiple creatures, players, and/or planeswalkers at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will trigger only once.