Cheapest priced copy (The Lost Caverns of Ixalan Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Wayta, Trainer Prodigy 
Legendary Creature — Human Warrior · 1/5 · Mythic · The Lost Caverns of Ixalan Commander · #7
Haste
{2}{G}, {T}: Target creature you control fights another target creature. This ability costs {2} less to activate if it targets two creatures you control.
If a creature you control being dealt damage causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.99 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan Commander | 7 | Mythic | $0.99 | $0.99 |
| The Lost Caverns of Ixalan Commander | 32 | Mythic | $1.49 | $3.99 |
3 rulings from Wizards of the Coast
- 10 November 2023Wayta, Trainer Prodigy's last ability affects only triggered abilities whose trigger conditions refer specifically to damage being dealt, such as the ability granted by Mephidross Vampire or the last ability of Wrathful Raptors. It does not affect triggered abilities that would trigger because of the results of that damage. For example, if you control an Ajani's Pridemate ("Whenever you gain life, put a +1/+1 counter on Ajani's Pridemate") and you activate Wayta, Trainer Prodigy's second ability targeting a creature you control with lifelink and another creature you control, the triggered ability of Ajani's Pridemate will still trigger only once.
- 10 November 2023Wayta, Trainer Prodigy's last ability doesn't copy the triggered ability; it just causes the ability to trigger twice. Any choices made as you put the ability onto the stack, such as modes and targets, are made separately for each instance of the ability. Any choices made on resolution, such as whether to put counters on a permanent, are also made individually.
- 10 November 2023If you somehow control two copies of Wayta, Trainer Prodigy, a creature you control being dealt damage causes abilities to trigger three times, not four. A third Wayta, Trainer Prodigy causes abilities to trigger four times, a fourth causes abilities to trigger five times, and so on.