Cheapest priced copy (Jumpstart): $0.49 at Card Kingdom, near mint, their price list as of .
Kels, Fight Fixer 
Legendary Creature — Azra Warlock · 4/3 · Rare · Jumpstart · #15
Menace
Whenever you sacrifice a creature, you may pay {U/B}. If you do, draw a card. ({U/B} can be paid with either {U} or {B}.)
{1}, Sacrifice a creature: Kels gains indestructible until end of turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 at Card Kingdom
6 rulings from Wizards of the Coast
- 23 June 2020A legendary permanent that is put into a graveyard because of the "legend rule" isn't sacrificed.
- 23 June 2020You can activate Kels's last ability even if nothing's about to destroy it and even if it already has indestructible.
- 23 June 2020If you sacrifice Kels, its middle ability triggers. It also triggers for any other creatures you sacrifice at the same time. You can sacrifice Kels to pay the cost of its own ability.
- 23 June 2020Kels's middle ability is a triggered ability, not an activated ability. It doesn't allow you to sacrifice a permanent whenever you want; rather, you need some other way of sacrificing permanents, such as Kels's last ability.
- 23 June 2020While resolving Kels's middle ability, you can't pay {U/B} more than once to draw more than one card.
- 23 June 2020If you sacrifice a permanent as part of a spell or activated ability's cost, Kels's middle ability will resolve before that spell or ability.