Cheapest priced copy (Commander 2020): $20.99 at Card Kingdom, near mint, their price list as of .
Surly Badgersaur 
Creature — Badger Dinosaur · 3/3 · Rare · Commander 2020 · #57
Whenever you discard a creature card, put a +1/+1 counter on this creature.
Whenever you discard a land card, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")
Whenever you discard a noncreature, nonland card, this creature fights up to one target creature you don't control.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $20.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 57 | Rare | $20.99 | — |
3 rulings from Wizards of the Coast
- 17 April 2020If the target creature is an illegal target when Surly Badgersaur's last ability tries to resolve, the ability doesn't resolve. If it's a legal target but Surly Badgersaur is no longer on the battlefield when the ability resolves, the target creature won't deal or be dealt damage.
- 17 April 2020Surly Badgersaur's abilities are triggered abilities, not activated abilities. They don't allow you to discard a card whenever you want; rather, you need some other way of discarding a card, such as a cycling ability.
- 17 April 2020If you discard a card as a cost to cast a spell or activate an ability, Surly Badgersaur's triggered ability resolves before that spell or ability but after you've chosen targets for it. If you discard a card while a spell or ability is resolving, that spell or ability finishes resolving before Surly Badgersaur's triggered ability does.